It's all about creating a climate of intimidation, silencing dissent and then using that silence to claim the public agree with them.
I'm not Jewish but, having seen the behaviour of the Gaza MP supporters at the last election and the behaviour of the masked-up antifa types at protests, I would be worried about what these bullies might come back and do if I didn't go along with their worldview.
As for the Greens, they are basically the Iranian socialists heading for a shock in the late 1970s.
The treatment of Matt Lucas was disgusting, too. Demanding Jewish people (or anyone) chant your slogans, with a heavy dose of implied threat. Bit like when the Jewish man in Amsterdam was beaten and thrown in a canal and told he couldn't come out until he chanted those same words.