I think it's worth noting that we are (yet again) having a self-criticism session because a leftist (someone so far to the left that they consider liberal egalitarian Yvain to be beyond the pale of tolerability) complained that people who disagree with them are occasionally tolerated on LW.

Come on. Politics is rarely discussed here to begin with and something like 65*% of LWers are liberals/socialists. If the occasional non-leftist thought that slips through the cracks of karma-hiding and (more importantly) self-censorship is enough to drive you away, you probably have very little to offer.

*I originally said 80%, but I checked the survey and it's closer to 65%. I think my point still stands. Only 3% of LWers surveyed described themselves as conservatives.