space I'll play devil's advocate and say 'yes'.
I'd be a little bit happier if the police waited until a proper, actual crime had been committed before arresting someone 20 handed and pepper spraying them. And when I say 'proper' I mean proper in the sense of serious, not some loosely focused/defined/catch all public order offence. I'm not a supporter of the chap, but i think the mere fact that he wasn't wanted there isn't sufficient for the 5-0 to get involved in the numbers & voracity that they did.
"You're not wanted here!" I get very nervous when the police start using such phrases; as if 100k people had a homologous view, and had whispered it in the ear of the commanding officer. He wasn't there to espouse anti-Semitic views, quite the contrary. The mere dislike of someone shouldn't be sufficient to ban them from lawful assembly/behaviour in the public realm.
What happened previously is a bit of a straw man, arrest someone for a crime committed, not one that they allege will occur or one that was committed by someone else. As I said, the police have more than enough power to shut down the coffee shop and sit with him until the march was an hour under way; and take all the wind out of his sails. Low key. Proportional. No clout. That to my mind was a sensible solution to the problem, rather than sending Laurel & Hardy in in blue vests and ask to see his NUJ card, and escalate it from there.
To my mind, you're viewed by how you treat your enemies. And the shoes you wear. Possibly your hi-fi as well.