I doubt that @danimagoo or anyone else responding is for genocide or indifferent to it. Just in case you weren’t sure where people are coming from.
As to your question, I guess one stays home on election day and risks that not voting for Harris could contribute to putting a gleeful enabler of two genocidal leaders in the Oval Office for (at least) the next four years. One can then wait for plaudits for one’s uncompromising purity, but it may be a long wait and when they come it may be from one’s fellow inmate in a gulag barracks.
A good first step is to prevent the election of people like Netanyahu. Trump and Netanyahu are in lockstep on the dehumanization of “enemies” they feel need to be eliminated. Neither believe in democracy or the rule of law, especially when it’s pointed at their own crimes. Doing anything that would allow the election of “an American Netanyahu” is a vote for the expansion of genocide.