Indeed. I think that is likely to be true of many of the protesters. They don’t really know what they are talking about and that puts the lie to the idea that they are a horde of anti-semites. Most of them are likely to be moved by the images of bombings of the buildings in Gaza.
Here's the thing that we all have to accept about various groups, groups we belong to and groups we oppose, there's lots of different folks with lots of different agendas and knowledge in them.
These protests clearly include folks that are genuinely horrified by starving kids, some understand the last 100 years of history that created this situation, some have no idea and think it all started on October 8th, some are rabid antisemites, some just seem to think that all things western, European, and/or American are bad. It makes nut picking easy and useful dialogue and solutions hard.