I tolerate posts like [More ominous than a (marriage) strike], but LW would seem like a friendlier place (to me) and possibly even be more rational if articles about gender issues would take utility for men and women equally seriously.

Well, since that post quotes liberally from a "manosphere" website, you'd be justified for assuming that it does take men's welfare more seriously than women's. But for what it's worth, it's mostly concerned with trying to predict men's strategically reasonable response to a change in institutions, and determining the resulting equilibrium. Whether you value men's and women's welfare equally doesn't much affect how bad the projected outcome is.

I keep getting an impression that the point is that people don't have enough inhibitions against killing for the greater good ...

Why? A standard result in the trolley-problem literature is that folks deviate from utilitarian ethics in a way that's suggestive of just such a moral injunction. People on LW are different, in that they tend to be highly committed to utilitarianism. But we already knew that - the way trolley problems are discussed here is just more evidence of this fact.