Let me restate. There is no equivalence between killing people in camps and having an office job at Google.

Agreed that the comparison is extreme; I wouldn't have made it myself.

But it's also not harmless to work at a company which makes tools/components/software for killing people. It wouldn't be "just an office job". Sometimes it's hard to make the call, e.g. a spreadsheet can be used to tally inventory or prisoners at a work camp, but when your company is directly involved e.g. in enabling surveillance by a nation whose actions you consider immoral, then it's probably time to quit.

If the mention of the US or Trump as the motive for quitting makes anyone irritated, consider the same situation if it was a guy saying he won't work for a company which is developing AI to enable Putin to better identify dissenters or bomb Ukraine.