Kimberlin is probably doing this himself.
I agree. This is a classic technique by a Gangster Govt. You have some "loose cannons" who want to kill or defame/smear your enemies? Let them do it! Shield them. Let them know nothing will happen. The DOJ could have a complete file on Kimberlin's "swatting" efforts, and the file is in a "take no action" cabinet.
Pretty soon other "loose cannons" take notice, and they begin to do the same. The FedGoons don't need to pull any triggers, they just need to give their nutjobs a free rein. It's the opening stages of civil war by assassination; more about that later in an essay I'm working on. (See my above reply.)