Scratch that other useless post out, sorry mods and officers.
This is probably just an attention whore act blown out of proportion. If he has people that have pictures of him AND pertinent information about him on a particular website, I don't think he would even attempt something like this. But he may be a nut case, so that could be crossed out.
And I imagine that all he is doing is bluffing, he has no actual proof of his ownership of arson equipment, all he has is a picture of something resembling a dry-ice container. A blurry one at that. His former posts aren't exactly what you'd call reliable evidence too, I mean I could go on about how I am a millionare playboy for dozens of BBS and news posts, and establishing all of that with semi-interwoven posts regarding the matter. Like I could find pictures of an unknown person who looks that he has a playboy lifestyle and is rich and constantly show people that as my proof. I could reply to threads with answers that my established persona would say, and people would believe me, and if I say something such as "I got a part in a porno!!!" people would see the fake pictures and posts as proof.
So basically in a sense, what precautions we are taking to avert a controversy are good, but in my opinion this has been blown out of proportion in a sense.