There are plenty of Jewish people on these marches, who have every right to stand up and say not in our name. A Jewish bloc attends every single one: https://jfjfp.com/voices/jjp-at-the-gaza-demonstrations/
Jewish peoples lives are being made less safe by this war, as we recently saw in Manchester and in the clear increase in antisemitism. They want to see Peace, and this will only happen with justice for the Palestinians. Most have - within living memory - members of their families who have been murdered by an authoritarian regime. They know what they are seeing and why they are marching.
Calling going on march 'indulging in Jew hatred' is just ridiculous. You've clearly never been on one.
Engage your critical faculties and think about why these marches are being smeared, rather than spouting what the right wing press and home secretary tell you.