Most BDSM practitioners align "SJW". These are conservative values that kicked him out.
No, it wasn't. He was kicked out because his sexual proclivities include the domination of women, specifically. To quote Buytaert word-for-word:
In the end, I fundamentally believe that all people are created equally. This belief has shaped the values that the Drupal project has held since it's early days. I cannot in good faith support someone who actively promotes a philosophy that is contrary to this. The Gorean philosophy promoted by Larry is based on the principle that women are evolutionarily predisposed to serve men and that the natural order is for men to dominate and lead.
You are correct that traditionally it'd be conservatives making a stink about someones sexual proclivities. That has changed, and is no longer true (well, never really was for some people, like the radicals who think that all sex between men and women is rape). Nowadays, nominally "liberals" are also opposed to certain kinds of sexual behavior, if such behavior doesn't fall into their acceptable category. They usually define "acceptable" different than conservatives, though in this case they both more or less agree.