Liberals and others are going to attack you, not just from points of view they know you find abhorrent, but from within.
Especially in the US. COINTELPRO was and remains intensely effective. If you are a leftist, do you really think capitalism isn’t clever enough to figure out that attacking head-on isn’t the way to destroy our organizations?
They know what issues we worry about. They know to accuse us of misogyny, homophobia, racism, transphobia, ableism, even liberalism because they know that that’s shit that can actually divide us, that those accusations will actually stick and matter within our communities. Tarring effective organizers with those labels works, because those labels are actually things we abhor and accusations of those kinds are very difficult to refute.
Which is not to say that those issues or accusations should be ignored, just that the guilt on accusation and the “no one is redeemable” purity politics I see happening a lot are not a way to win.