You don't think non-consensually revealing somebody's identity is a problem?
Resorting to DDoS is not pretty, but "why is my violent behavior met with violence" is a little oblivious and reversal of victim and perpetrator roles.
If it's information that's medium-difficult to get, and the only people that would use the information to cause harm can easily put in more effort than that, then I don't think it's "violence" to post that information.
I do think it’s a problem. You are the only one excusing bad behavior here.