From eyeballing the survey results, we might expect the worst ideological conflicts on LW to be those current among libertarians, liberals, and moderate-to-mainline socialists, and especially those that're interesting to nerds with those affiliations: not, for example, abortion or immigration, where one camp's almost exclusively conservative. And indeed, the most heated political arguments on LW that I remember have dealt with radical feminism, fat acceptance, the treatment of women in nerd culture, and anything vaguely associated with pick-up artistry. Nothing economic, which is a bit of a surprise, but maybe it's easier to cast those issues in consequential terms -- or maybe taxes just aren't sexy.

The ethno-nationalist wing of neoreaction has also caused problems, but I think that had less to do with the subject matter and more to do with the poster: long-time SSC readers may remember him as Jim.