This is insightful. I also think we should emphasize that it is not just other people or silly theistic, epistemic relativists who don't read Less Wrong who can get exploded by Philosophical Landmines. These things are epistemically neutral and the best philosophy in the world can still become slogans if it gets discussed too much E.g.

Of course I'd learned some great replies to that sort of question right here on LW, so I did my best to sort her out,

Now I wasn't there and I don't know you. But it seems at least plausible that that is exactly what your sister felt she was doing. That this is how having your philosophical limbs getting blown off feels like from the inside.

I think I see this phenomena most with activist-atheists who show up everywhere prepared to categorize any argument a theist might make and then give a stock response to it. It's related to arguments as soldiers. In addition to avoiding and disarming landmines, I think there is a lot to be said for trying to develop an immunity. So that even if other people start tossing out slogans you don't. I propose that it is good policy to provisionally accept your opponent's claims and then let your own arguments do their work on those claims in your mind before you let them out.

So...

Theist: "The universe is too complex for it to have been created randomly."

Atheist (pattern matches this claim to one she has heard a hundred times before, searches for the most relevant reply, outputs): "Natural selection isn't random and in that case how was God created?"

KABOOM!

Instead:

Theist: "The universe is too complex for it to have been created randomly."

Atheist (Entertains the argument as if she had no prior experience with it, see's what makes the argument persuasive for some people, then searches for replies and applies them to the argument "Is natural selection really random? Oh, and God, to the extent He is supposed to be like a human agent, would be really complicated too. So that just pushes the problem of developing complexity back a step."): "Oh yeah, I've heard things like that before. Here are two issues with it...."

Obviously this is hard to do, and maybe not worthwhile in every situation.