Could he be physically dangerous? What would he do if he got dox on Kitty? ....... Should we be worried?
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I don't think he is a face-to-face kind of guy, no such bravery. He harassed those young girls online, he harassed the waxing women online or by phone. He has done his interviews by skype. When someone has approached him in person (reporters at courthouse, on street), he runs/scoots away, asks for police escort, gets his mother to run interference by assaulting the interviewer. And of course, Blaire White was doxed on air quite spectacularly two days after her interview of him - I don't know who is responsible, but if him, it's another instance of hurting someone from a distance.
(He did go into the women's restrooms but no evidence he did anything but turn his back to them and surreptitiously take photos. He also recently went to the pool, but again appears to be surreptitiously taking photos of behind him, he's not interacting with anyone and no one is approaching him. And he's in person at court, but he has the protection of the process and the Member.)
He *does* appear to be very vindictive, though - like it's part of clinging to some sense of "integrity". My guess would be that he wouldn't go at wgKitty face-on. Perhaps s/he could check tires each time s/he gets into the car, at night make sure the home doesn't appear to have been entered, glance over mail before touching it too closely, etc. Keep receipts for awhile as they'll have location and time stamps. Maybe keep a log of where s/he is for awhile with any witnesses listed so JY can't accuse him/her of being somewhere causing JY trouble. Might be helpful for everyone in the building to do that for awhile, since he doesn't know who wgKitty is.
Not to sound so dramatic! I think he is vengeful, but a wimp. So just a hint to not assume that if your eyes are open you will see the threat coming - because that would be too brave for him I think. He probably won't do anything at all - but if he does, IMO it will be "from the side"...
It would, and Null and the Admins can probably make the needed report without needing to Dox WGKitty. He or She has been identified as an anonymous source within Yaniv's building. The operators of the web service that the threats were transmitted across can call it in.
If needed, maybe there is a Kiwi attorney who can speak for WgKitty, would that work to keep him/her anonymous from JY?