We actually label persuasive strategies that can be used to market our true ideas as "dark arts".
The linked page specifies that the "dark arts" specifically take advantage of biases for persuasion. So it's a bit misleading to say "We actually label persuasive strategies that can be used…", because we do not label all strategies as such. Our goal should be to snap people out of their biases, so that they can naturally accept anything that turns out to be true. That could be taken as a "persuasive strategy", but it is not a dark one.
I'd favour attempts to develop bias-busting techniques intended to be used on general audiences. (Have there been any discussions about this — developing, as it were, a Defense Against the Dark Arts curriculum?) I would oppose attempts to evangelize our conclusions to general audiences without imparting to them the underlying framework of rationality that would allow them to independently discover or at least verify these conclusions. Using sophistry to persuade someone of a truth isn't much better than using the same tricks to persuade them of a falsehood, and even if we ignore moral issues, it is nearly useless, because if a person ends up with better ideas but all the same biases, their heads can later just as easily be filled with whole new sets of bad ideas by other Dark Arts practitioners.
Edit: I'd like to add that I don't mean that I believe biases can be countered with Pure Reason — which, I suppose, is what makes them bisaes in the first place. As the saying goes, we can't reason people of what they were never reasoned into. Debiasing techniques will not consist solely of rational arguments based on evidence, because the goal is to get people to the point where they can accept such things in the first place. But that does not mean that we have to, or ought to, resort to actively bad reasoning. (Especially to someone with an anti-reason worldview — serious anti-epistemology — invalid logical arguments don't work any better than valid ones anyway.) That, I think, is something that the prominent members of the "New Atheist" movement (it's not all that new, I know) are getting right (for the most part). This movement is unapologetic, it's emotional, it can be abrasive and offensive at times, but it's not dishonest. As one example of that, see, for instance, PZ Myers strongly criticizing a recent study which, in part, appears to show a positive correlation between IQ and atheism. He didn't have to criticize it. He could have been among those "patting [them]selves on the back". But he sided with intellectual honesty over embracing a potentially flawed argumentative tool. If we want to spread rationality, we should be thinking along the same lines.
Saying there are white arts as well as dark ones is conceding the point, isn't it? One should be allowed to be persuasive as well as right, and sometimes just being right isn't enough, especially if the audience is judging the surface appeal of an argument (and maybe even accepting it or not!) prior to digging into it's meat. In such situations, attractive wrapping isn't just pretty, it's a prerequisite. So, I love your idea of inventing a protocol for DAtDA.
The product of Less Wrong is truth. However, there seems to be a reluctance of the personality types here - myself included - to sell that product. Here's my evidence:
We actually label many highly effective persuasive strategies that can be used to market our true ideas as "dark arts". What's the justification for this negative branding? A necessary evil is not evil. Even if - and this is a huge if - our future utopia is free of dark arts, that's not the world we live in today. Choosing not to use them is analogous to a peacenik wanting to rid the world of violence by suggesting that police not use weapons.
We treat our dislike of dark arts as if it's a simple corollary of the axiom of the virtue of truth. Does this mean we assume the ends (more people believe the truth) doesn't justify the means (persuasion to the truth via exploiting cognitive biases)? Or are we just worried about being hypocrites? Whatever the reason, such an impactful assumption deserves an explanation. Speaking practically, the successful practice of dark arts requires the psychological skill of switching hats, to use Edward de Bono's terminology. While posting on Less Wrong, we can avoid and are in fact praised for avoiding dark arts, but we need to switch up in other environments, and that's difficult. Frankly, we're not great at it, and it's very tempting to externalize the problem and say "the art is bad" rather than "we're bad at the art".
Our distaste for rhetorical tactics, both aesthetically and morally, profoundly affects the way we communicate. That distaste is tightly coupled with the mental habit of always interpreting the value of what is said purely for its informational content, logical consistency, and insight. I'm basing the following question on my own introspection, but I wonder if this almost religiously entrenched mental habit could make us blind to the value of the art of persuasion? Let's imagine for a moment, the most convincing paragraph ever written. It was truly a world-wonder of persuasion - it converted fundamentalist Christians into atheists, suicide bombers into diplomats, and Ann Coulter-4-President supporters into Less Wrong sycophants. What would your reaction to the paragraph be? Would you "up-vote" this work of genius? No way. We'd be competing to tell the fundamentalist Christian that there were at least three argument fallacies in the first sentence, we'd explain to the suicide bomber that the rhetoric could be used equally well to justify blowing us all up right now, and for completeness we'd give the Ann Coulter supporter a brief overview of Bayesianism.