This is really well put and I agree with most of it. But I do think the police officer was almost redefining being visibly Jewish as a crime. The Jewish guy was being threated with getting his collar felt when it should have been the protestors verbally abusing him. But I think the police officer was caught in the heat of the moment and was genuinely concerned for a) the man's safety and b) wider trouble breaking out. I'm sure he hugely regrets such a clumsily-worded response now. There just aren't enough police on the ground to potentially deal with trouble breaking out on a large scale. At the same time, I'm loathe to give the Met too much benefit of the doubt given their attitude to other minority groups.
The question that should be asked is why a Jewish man can now not walk around "openly Jewish " and feel safe and whether the protest march is genuinely "peaceful ".
Yes, this is the wider issue for me. The police officer was inadvertently acknowledging that Jews are not safe in this city, the protests have a simmering undercurrent of hatred towards Jews and are therefore not peaceful, and that they're being attended by antisemites. Whether that's a small or large minority of protestors is academic really because the atmosphere this is creating for Jews is horrendous.
I've just read that the rabbi at Columbia University has told his students to return home and stay there because the Uni and NYPD can't guarantee their safety on campus any more. I hope we're not sleepwalking into a similar situation in the UK.