There are officially recognized war crimes and crimes against humanity. There's national sovereignty. These aren't "pithy thoughts", they're well regarded basics that Israel regularly violates with the support of the US.
Go look at the UN Council on Human Rights, which is historically a literal who's who of human rights abusers.
The UN Security Council is actually the only UN group that can officially declare Human Rights Abuses... but of course a single veto prevents that.
The ICC has its own host of issues around bias.
I guess my point is most issues are not as clear cut in the moment as they are in retrospect.
Some are clearer than others, of course. But life is messy, and the victors have always written the narrative that past events are judged. It's a relatively recent artifact where we can argue about this stuff in real time.
