"We" knew about the situation in Warsaw, wee even communicated it to our eastern allies, but none of us cared enough to actually do anything - indeed there's quite a lot of evidence showing that the Soviets deliberately held back until the ghetto was liquidated.
Having reflected on our convo a bit more, I also think that Israel sees the Occupied Territories, as well as the refugee camps in Lebanon, Syria, Egypt and Jordan as both an object lesson to their neighbours, and as a way of illustrating the myth of pan-Arabism to the ignorant - that is, to the ignorant, the state of Israel can say "look, these regimes haven't naturalised their brother Arabs, even though they've been in those camps for 40/50/60 years", neatly eliding the fact that many Palestinians have resisted being naturalised into the populations of those countries because they wish to retain their Palestinian identity.