A vote is not endorsement. Abstaining from voting or protest voting because you can't handle the cognitive dissonance of voting for someone who supports Israel is not the moral high ground. It's not negotiable because there are no options that do not support Israel.

"A vote is not endorsement" They are actually synonyms. The option that does not support Israel's genocide is not voting for anyone who facilitates Israel's genocide. The genocide may continue, but at least you wouldn't personally be actively voting for its continuance.