This has occurred to me as well. Abolitionism is by definition an extreme philosophy in the sense that its goal is to lay waste to an entire institution rather than reform it or dismantle it piece by piece. And as you suggested, that sort of all-or-nothing mindset typically generates intense opposition, which in turn leads to alienation. That’s a path that only certain types of people can handle, namely those who are comfortable with solitude, or can at least tolerate it better than most. Combine that with an unwavering commitment to a moral principle, and you’re left with someone whose purpose is eminently noble but who’s also a little antisocial and exceedingly wary of other people.