Check the '45 goals of communism'. Antifa are communist scum and will "support" anything that fucks up the West. They don't care about gays, but they "support" the subversion of marriage and family that comes with the LGBT movement. They don't care about black lives, but they "support" the destruction wrought by easily-manipulated black mobs. They don't care about trannies, but they "support" the social degeneration. They will pretend to support anything that hurts Western values, and they do so by pretending to be the good guys to win over the liberals.