they were the arguments one sees time and again from people who aren't (consciously) trolling.

I think this is quite a large part of it. I have several times on Less Wrong followed discussions that seemed to be headed towards trollishness, and then all of a sudden someone changes their mind, updates, and everyone moves on. It is one of the things I love about this website, and I would be sad if an anti-trolling sentiment led to these sort of discussions being abandoned before they concluded. Sometimes persistence is a waste of time, but sometimes it makes a difference.