Because many in these marches are far from peaceful and far from well intentioned.
Some may well be marching for peace, but they do so alongside Hamas flags, swastikas and anti Jewish chanting which rather undermines their cause.
The police were holding up a mirror to the sentiment of those marches by telling the man how much in danger he was, simply by virtue of being a Jewish person in their presence.
And you can see how insidious it is and how marches like that are legitimising these people just from some of the comments people feel safe to make in this thread. For instance, I mentioned how resonant with 1930s Europe the current zeitgeist is and some numpty pipes up about Israel and genocide being to blame with seemingly zero awareness of why what they said is so deeply problematic, rather confirming the point about how at risk Jewish people in London are right now.
If the police are openly admitting how ‘non peaceful’ these marches are then I hope people will give up pretending that what they are doing is moral and virtuous and we all start feeling safer to call it out for what it is.
it’s a shame as the right to protest is one of the many rights that separates western democracies from some of the terrifying regimes causing such suffering in the Middle East - there should be nothing frightening or dangerous about people coming together in the name of peace; so it does rather beg the question what they are really there for !?