Like sibling says, doxxing implies that you'll post their personal info online.

The problem does not lie in attacking bad people, the problem is that there is a high risk that you THINK you've identified who the bad actor is but actually the person you decide to "retaliate" against had nothing to do with what was done to you. That's why we leave law enforcement to the law enforcement officials and justice to the justice system. Even they make a lot of mistakes but at least there is a process that gives a chance for the truth to be found.

But sharing info about a suspect with law enforcement is what you should do yes.