You don’t have to like me. You just have to believe I’m a human being.

http://www.theestablishment.co/2016/11/29/you-dont-have-to-like-me-you-just-have-to-believe-im-a-human-being/

The article above is an eloquent exposition of one the major tenets of humanism.  Once anyone, for any reason, becomes the enemy, the adversary, or in some sense other, and they forfeit humanity in the tribe or movement mores all hope for reconciliation is lost.  

You don't have to like herm or herm cause, but if you decide that hesh is less than human all that is left is hate.  And hate always leads to self-destructive actions.  You may oppose herm and resist as possible, or even ostracize herm if some reconciliation is impossible, but it is critical to remember that all are human, doing the best they can as they see it for humanity. 

It may be that another human or group of humans may opt out of the humanist circle by their behavior and it may be necessary to isolate them or eliminate them as humanely as possible, but they are and must remain human. 

Your enemy is never a villain in his own eyes.  Keep this in mind; it may offer a way to make him your friend.  If not you can kill him without hate -- and quickly.  Lazarus Long, Time Enough For Love, Robert A Heinlein, 1973.