> The same reason speakers on Palestinian rights often can. While they may be on the right side of the issue, it's also very easy for closed discussion spaces to rapidly devolve into pretty viciously anti-semitic tropes.

I agree. Maybe a more precise way to think about this is that they’re only on the “right side” of the issue to the extent that “the other side” is “Israeli settlement policy” rather than “Jews” or “the existence of Israel as a state”.