Listen, this can go back and forth forever - indeed it feels to me like it has just on this thread. It's clear you have extremely strong views on the Gazan situation, and are not American. That's obviously fine, and is the case for many posters on here. You're able to opine that voters should rationally choose to 'punish' Joe Biden because his actions vis-a-vis the Gazan war seem to you as the 'red line' and he's crossed it. The fact is, you can think that because you have very little skin in the game.
But for those who are actually American, who have to live in the states for the next four years the calculus is not that simple. In fact, reducing such a crucial election to any single issue is, imo, simply irresponsible given the context. The US is on the precipice of something genuinely horrifying, and it is sleep-walking over the edge. The Christo-facists have stacked the courts, agencies which are crucial to the running of the largest power on Earth are being staffed with zealots and the next President could well be basically incapable of complex thought. The repercussions of this are so bad that it should not even be a consideration, yet here we are.
I know it feels cathartic bitching about 'genocide Joe' and (somehow) believing that he could single-handedly stop the war today and that you're so riled up about Gaza (and only Gaza it seems) that you'd throw all the babies out with that bit of bathwater but any rational American voter has to factor in everything else.
So yes, I believe any American voter who looks at Gaza and says: "you know what, that's so bad, I'd prefer to help Donald J Trump become the next President" is, in fact, dumb. Because there is simply no logical path to follow whereby electing Trump is likely to make said voter's life better, their loved ones' lives better or Gazan lives better. Therefore, it is an irrational vote, and for me, dumb.