There a lines a person can cross which make them the enemy. Which make their humanity irrelevant to how we deal with them. Leftists are cool with this for fascists. Cool with it for cops. Many are cool with it for soldiers in Imperial armies. Some even for snitches. But not for rapists.
One thing I really hate about the way we talk about abusers and rapists is that the possibility of change and forgiveness is conflated with those things having actually happened.