Exactly this here. All this purity posturing drives people away from movements.

I like to borrow a phrase from Stratagem Twenty-Two (Catch the Thief by Closing His Escape Route):

围师必阙，穷寇勿迫。

Roughly translated it means, “When you surround an army, you must leave an outlet; do not press a desperate enemy too hard.”

Translating this into social movements, I’d express it as, “Leave room for redemption; don’t shun the opposition forever”.

Because if people think there’s no path to redemption, they won’t try to redeem themselves. They’ll go further down the path that you don’t like.