Outing anonymous critics and threatening them with death

So this has me somewhat upset. A pseudonymous critic of Rabbi Yosef Mizrachi, Dana Cohen, has disappeared from Facebook, apparently shortly after one of Mizrachi's followers tracked his/her IP address.

While one may disagree with some of Dana's positions and/or approach, this is somewhat disturbing.

To explain, Rabbi Mizrachi has stated in the past that:

1) Dana Cohen is worse than Hitler
2) He wishes anonymous commenters and critics would be out in the open so that they could be killed.
3) He has followers who are thugs who will credibly threaten with death those who criticize him.

For #1, see this video, at the 2:10 mark.

For #2, see this video:
"... every IP number, have a name and automatically, if someone use his computer to public and to murder someone else in Internet, the whole world will know who he is and will be subject to lawsuits, and actions against him, and all kinds of things, even to get killed. Why? You want to kill someone else, expect him to come and kill you tomorrow."


For #3, see this video, from the 1 hour 32 minute mark, for a few minutes.




 where he says that though he knows his critic's identity, he won't reveal it, because his followers will make things rough for her. Because they are ex-criminals and tough guys. And then boasts how, when someone was opposing Rabbi Mizrachi, one such ex-criminal called the person up and threatened, if he didn't apologize to Rabbi Mizrachi, that he would come to his house, take him into the kitchen, and fry him in a pot. Or maybe drown him in a mikveh. And Rabbi Mizrachi had to beg him not to do it. He ends with 'This is not our way. But it is very sad that people lose their olam haba because they are very stupid.'

While it is good that he closed the anecdote with a claim that one shouldn't do this, his attitude while telling the anecdote seems (to me) to be one of amusement and pride. And there is this undercurrent of threat in the very telling of the anecdote -- he knows Dana Cohen is going to hear this, and so he is telling him / her to watch out, or else this might happen.

Frankly, if you have followers who are thugs like this, then it is more than inappropriate to make public statements that your critics are worse than Hitler and that an appropriate response to such criticisms is murder. As the Mishna in Avot (1:11) states:

אבטליון אומר, חכמים, הזהרו בדבריכם, שמא תחובו חובת גלות ותגלו למקום מים הרעים, וישתו התלמידים הבאים אחריכם וימותו, ונמצא שם שמים מתחלל.

I would fault Rabbi Mizrachi for the actions of his followers (including the attempt to find his / her IP address), and of the thuggish silencing of the pseudonymous Dana Cohen.