And certain folks keep telling me that if Israel didn't exist all the Jews would eventually be killed off in Holocaust 2.0 and I just don't buy that, sorry. So if my response seems a bit flippant, it's because I consider such a view insane.
That's not quite the claim. The claim is that if Palestinian liberationism wins that Jews will be killed off (together with others). Destroying the Palestinian movement is more important in this sense than preserving the Israeli state (particularly if you live outside Israel itself), much as destroying Nazism was more important than preserving the Second Polish Republic (...particularly if you lived outside the Second Polish Republic).
No ethnicity has a right to a country; there is no particular 'Jewish right to a state' or 'Palestinian right to a state'. Israel has the right to define itself as a Jewish state and take steps to preserve that definition, much as many other states and subnational entities define themselves in particular ethnic ways; but this flows from a right that states have, to determine within particular limits their ideologies, goals, and form of government, rather than some special privilege which accrues to Jews but not non-Jews. The idea that it cannot self-define as Jewish because a Jewish state would be inherently bad or unfair in some way really
is anti-Jewish in a very narrow way (and I say this carefully, because I think the hatred from the Palestinian movement goes far beyond Jews, which is why I try to refrain from calling them anti-Semites), but I'm not sure that focusing on this is helpful, because it distracts from the broader horrors of the Palestinian movement.