Whether understood or not, it is because of the implications of flying any western nation flag has a similar liability. Israel’s crimes are the west’s crimes and that is too close a comfort for most westerners ie functionally westerner = zionist (the western project is poisoned from the roots up with the only hope is the dialectics of it becoming the opposite of the montrosity it now is, negating itself in the process. To convey this in a way a westerner understands: if a nazi has a chance to redeems himself then it at least starts by being no longer a nazi.)