I disagree with your criticism of whataboutism as it really is irrelevant. I mean, what about when the Persians slaughtered the inhabitants of Miletus? Is it relevant?

But, I agree with your point about the US abandoning support of Taiwanese sovereignty, which they did in 1979 (though President Biden reaffirmed it) for political reasons. Bottom line is that Taiwan is entitled to self-determination and survival just as Israel is. I don't deny Israel has done some shitty things, but that doesn't justify the destruction of the nation of Israel.