Oh, violence, even lethal violence might be necessary in defense of self or others. But, we must not deny that we are dealing with persons. I'm not even saying don't dox the guy, I'm saying that don't forget that you are doxing a person.

The focus should be on rehabilitating the person and remediating any harm they have caused, not on returning harm with harm. Of course, if they are being violent or legitimately threatening violence, defensive violence SHOULD be taken to contain/control/remove the threat.

Violating his privacy might be a good lesson in how "we should balance privacy and safety" as part of his rehabilitation, but we can do that without dehumanization.