I understand your stated idealist position, “I won’t vote for someone engaged in genocide”.

I don't think it's particularly idealist, though it is formulated to appeal to those with empathy. If they won't listen to "genocide is a red line", what do you think they will listen to? A long-winded explanation of political organizing, realignments, game theory, economics? Just saying "don't support genocide" elicits a flurry of bad-faith insults and absurd lies.

… but the reality is that Trump win, which is likely without every possible Dem vote, will cause the worst possible genocide.

There is no bigger gun to threaten people with. There is already genocide with maximalist support from the United States and a deftly subjugated Europe. It even gets support from alleged "good guys" that vote for Democrats. No resistance except from those with personal connections, a stronger connection to empathy, or the politically educated.

So by withholding your vote you’re not complicit in Harris-supported genocide, but you’re complicit in Trump supported genocide, which everyone understands to be worse.

That's funny, I don't think I told anyone to vote for Trump, either. Instead, I do work against genocide, organizing actions, politically educating those who don't just sit on their computers and justify supporting genocide to one another.

As I often say in these threads, withholding your vote is precisely what the republicans want you to do.

Of course it is, because the GOP and Democrats are competing for votes for an election. Do you believe this to be revelatory?

Seriously, will your ideals be much comfort when Trump supported Netanyahu is grinding Gaza to dost?

That is already happening under the Biden-Harris administration that forwarded this genocide for over the last year. Have you not seen the destruction, mass murder, burning of children alive? Do you not know where those weapons come from, how they are donated, what logistical support they receive, how the US attacks all opposition to the genocide?