Not always. I posted a link to Greta Christina's "Atheists and Anger" elsewhere in this thread:
Which brings me to the other part of this little rant: Why atheist anger is not only valid, but valuable and necessary.
There's actually a simple, straightforward answer to this question:
Because anger is always necessary.
Because anger has driven every major movement for social change in this country, and probably in the world. The labor movement, the civil rights movement, the women's suffrage movement, the modern feminist movement, the gay rights movement, the anti-war movement in the Sixties, the anti-war movement today, you name it... all of them have had, as a major driving force, a tremendous amount of anger. Anger over injustice, anger over mistreatment and brutality, anger over helplessness.
I mean, why the hell else would people bother to mobilize social movements? Social movements are hard. They take time, they take energy, they sometimes take serious risk of life and limb, community and career. Nobody would fucking bother if they weren't furious about something.
So when you tell an atheist (or for that matter, a woman or a queer or a person of color or whatever) not to be so angry, you are, in essence, telling us to disempower ourselves. You're telling us to lay down one of the single most powerful tools we have at our disposal. You're telling us to lay down a tool that no social change movement has ever been able to do without. You're telling us to be polite and diplomatic, when history shows that polite diplomacy in a social change movement works far, far better when it's coupled with passionate anger. In a battle between David and Goliath, you're telling David to put down his slingshot and just... I don't know. Gnaw Goliath on the ankles or something.
I'll acknowledge that anger is a difficult tool in a social movement. A dangerous one even. It can make people act rashly; it can make it harder to think clearly; it can make people treat potential allies as enemies. In the worst-case scenario, it can even lead to violence. Anger is valid, it's valuable, it's necessary... but it can also misfire, and badly.
But unless we're actually endangering or harming somebody, it is not up to believers to tell atheists when we should and should not use this tool. It is not up to believers to tell atheists that we're going too far with the anger and need to calm down. Any more than it's up to white people to say it to black people, or men to say it to women, or straights to say it to queers. When it comes from believers, it's not helpful. It's patronizing. It comes across as another attempt to defang us and shut us up. And it's just going to make us angrier.
It is a fact of the matter - and this is me, RobinZ, speaking now - that "anger is false power" is a popular cached thought. (Those exact words are used in a bus advertisement in my area.) What I am telling you is that you should question that one - it is less general than is commonly supposed.
I posted a link to Greta Christina's "Atheists and Anger" elsewhere in this thread
What you quoted isn't really relevant to my point, which is that anger over a principle is not very beneficial to you as an individual, vs. passion or even faked anger in the pursuit of your concrete goals.
(I'd also strongly question whether e.g. Gandhi and MLK were motivated by anger over a principle, or the passionate pursuit of concrete goals.)
In general, fervor over principles is perhaps the most anti-rational emotional response that human beings have... and...
Daniel Dennett has advanced the opinion that the evolutionary purpose of the cuteness response in humans is to make us respond positively to babies. This does seem plausible. Babies are pretty cute, after all. It's a tempting explanation.
Here is one of the cutest baby pictures I found on a Google search.
And this is a bunny.
Correct me if I'm wrong, but the bunny is about 75,119 times cuter than the baby.
Now, bunnies are not evolutionarily important for humans to like and want to nurture. In fact, bunnies are edible. By rights, my evolutionary response to the bunny should be "mmm, needs a sprig of rosemary and thirty minutes on a spit". But instead, that bunny - and not the baby or any other baby I've seen - strikes the epicenter of my cuteness response, and being more baby-like along any dimension would not improve the bunny. It would not look better bald. It would not be improved with little round humanlike ears. It would not be more precious with thumbs, easier to love if it had no tail, more adorable if it were enlarged to weigh about seven pounds.
If "awwww" is a response designed to make me love human babies and everything else that makes me go "awwww" is a mere side effect of that engineered reaction, it is drastically misaimed. Other responses for which we have similar evolutionary psychology explanations don't seem badly targeted in this way. If they miss their supposed objects at all, at least it's not in most people. (Furries, for instance, exist, but they're not a common variation on human sexual interest - the most generally applicable superstimuli for sexiness look like at-least-superficially healthy, mature humans with prominent human sexual characteristics.) We've invested enough energy into transforming our food landscape that we can happily eat virtual poison, but that's a departure from the ancestral environment - bunnies? All natural, every whisker.1
It is embarrassingly easy to come up with evolutionary psychology stories to explain little segments of data and have it sound good to a surface understanding of how evolution works. Why are babies cute? They have to be, so we'll take care of them. And then someone with a slightly better cause and effect understanding turns it right-side-up, as Dennett has, and then it sounds really clever. You can have this entire conversation without mentioning bunnies (or kittens or jerboas or any other adorable thing). But by excluding those items from a discussion that is, ostensibly, about cuteness, you do not have a hypothesis that actually fits all of the data - only the data that seems relevant to the answer that presents itself immediately.
Evo-psych explanations are tempting even when they're cheaply wrong, because the knowledge you need to construct ones that sound good to the educated is itself not cheap at all. You have to know lots of stuff about what "motivates" evolutionary changes, reject group selection, understand that the brain is just an organ, dispel the illusion of little XML tags attached to objects in the world calling them "cute" or "pretty" or anything else - but you also have to account for a decent proportion of the facts to not be steering completely left of reality.
Humans are frickin' complicated beasties. It's a hard, hard job to model us in a way that says anything useful without contradicting information we have about ourselves. But that's no excuse for abandoning the task. What causes the cuteness response? Why is that bunny so outrageously adorable? Why are babies, well, pretty cute? I don't know - but I'm pretty sure it's not the cheap reason, because evolution doesn't want me to nurture bunnies. Inasmuch as it wants me to react to bunnies, it wants me to eat them, or at least be motivated to keep them away from my salad fixings.
1It is possible that the bunny depicted is a domestic specimen, but it doesn't look like it to me. In any event, I chose it for being a really great example; there are many decidedly wild animals that are also cuter than cute human babies.