I’ve given more details elsewhere, but the short version:

We can classify US presidential votes into three categories:

1. Vote for the Democrat
2. Vote for the Republican
3. Vote third-party/independent or don’t vote

The most effective vote to make on an anti-genocide platform is #1.

Voting for a Republican is voting for a party that appears to be profoundly okay with the genocide in Gaza AND wants to start some genocides of their own (e.g. against trans folks, immigrants and racial minorities). This is the most pro-genocide vote.

Voting for a Democrat is voting for a party that has a fairly significant group that opposes the genocide, and which appears to be movable on the topic.

Any other vote is roughly equivalent to not voting. On the presidental front, there is no chance in this election that anyone other than a candidate from one of the main two parties is elected, and that’s also true for most senate or house races. (Possibly all, but I don’t want to make that strong claim since I haven’t actually researched all the races.) Voting for a candidate who you know won’t win is explicitly choosing not to have a say between the tho feasible candidates.

I do have one caveat though…

If you live in West Virginia for example, it’s a bit more complex. There your choice is essentially “the Republican or not the Republican,” so third-party/independent moves into category 1. However, then I’d argue that voting for the Democrat for president may still be the preferable response because if the Republican wins the electoral college but, (as has happened in every presidential election since 1990 except 2004) the Democrat still wins the popular vote, it further delegitimises the Republican’s presidency and the electoral college.