I don't give things like that the benefit of the doubt... To (perhaps mis-)quote Commissioner Gordon in that Dark Knight movie, 'You're a Detective now - you don't get to believe in coincidences.'.
The Zionist entity DOES have extensive ties to our Police and Intelligence apparatus, sadly. And they have all kinds of agents and assets, blackmail victims and collaborators - witting and unwitting, paid and unpaid.
In the past, the CIA/Mossad (and likely the FBI and DHS, and local police) have used the ADL as cutouts and contractors, to spy domestically on Pro-Palestinian and Anti-Zionist activity. I'm not even sure, in the present moment, how much they're actually prohibited from engaging in domestic spying, anymore. In any event it's not hard to tip off one of your heavily propagandized/Mind Controlled loonies, to show up at a rally (that you tell them about, or make sure that they're aware of in dome other way) - and let them either disrupt as freelancers, or even act-out, according to a specific assignment.