I was contacted by a reporter for a local news outlet who saw this thread, and I was told that these guys did, in fact, pepper spray someone yesterday in Menlo Park-- and it was after my video, which I took at 10:41 a.m. The outlet may end up using my video in the online article. No one was apparently arrested in the subsequent incident, so it appears these guys succeeded in goading someone else into being pepper sprayed. Funny that the officer didn't mention that later in the day when I made the formal report, even though he was the officer for that incident.
I do appreciate the (conflicting) advice-- it's a tough situation overall, I would just ask folks to keep in mind that having a video makes it easy for everyone to second-guess the interaction from the comfort of their own computer instead of being in the middle of a fluid, ambiguous, and unfamiliar situation. Also, I'm an easy punching bag because my real name, website, email, and raw video are on here and everybody has their idea of what a lawyer is or should do in any situation. I personally would rather be an idealist than indifferent, so that informs my world view. I still have zero regrets, though of course I don't want to run into these whacked out nuts again. I'm not going to not shop at my favorite grocery store because of these jerks, so we'll see whether they ever come back.