We will then have to work extra hard to counter this and also support all democrats in the actual election (even the ones supporting Isreal) otherwise the democrats will have no power and any elected democrats who want to push back on Isreal will be totally sidelined.

That wasn’t a concern when centrists like Gillibrand were making openly bigoted attacks on Mamdani. After his primaries, of course. Unconditional support is only demanded for centrists. Never progressives.