They think they can maybe sway Harris/the dems in general. Not unreasonable, seeing as IIRC they stand to potentially lose Michigan due to its (relatively) large muslim community which will likely have reduced turnout if her policies stay the same.

There is no convincing Trump or the repubs. Their voter base LOVES genocide. The only people who aren't onboard are some of the more extreme neo-nazis, who only disagree because they hate jews (I note here that Israel is not representative of all jews, and to claim so is anti-semitic, but these are neo-nazis) more than they hate muslims.

because Harris says one thing and does the opposite, while trump straight up says he supports the genocide.

Trump isn't courting their vote, Harris is. Trump isn't saying he wants what they want, Harris does.
Trump is a republican and as such would never be able to get the leftist vote, democrats are, which is why leftists try to reason with them.

The best way I've heard it described is like this: Republicans are werewolves outside the cabin openly howling for blood. I expect no consideration from them.

Liberals are other humans in the cabin with us who, despite professing to hate and fear the werewolves, refuse to hand over the silver bullets or lock any doors. I have been told that they want what I want, so their constant capitulation to the werewolves' demands arouses baffled frustration.

Republicans don't even try to pretend to give a fuck about anyone that's not white/cis/male/straight/ Christian/ western.

Unlike Democrats who have made it their identity