It's not, pro-palestine crowd in USA is relatively politicaly concious, so you would be hard pressed to find people from that group that didn't vote for Harris. Idea that people caring about Gaza in USA would be unaware that Trump is worse pick is flawed, as it would require both awareness about foreign affairs and USA capabilities in terms of negotiating the ceasefire, and also being completely unaware of Trump attitude towards Palestine and Israel. Also, anyone caring enough to protest most likely cares enough to vote, so those people weren't the issue.
Dems fucked up their campaign big time and now they're looking for scapegoats to blame, unable to admit to their many flaws that led to this result.
IQ tests intentionally omit any questions related to empathy, emotional intelligence and creativity, so it can favour people from the top of the pile and act as accurate perdictor of success in ruthless capitalist society. It implicitly promotes lack of those traits in individuals and explicitly promotes the definition of intelligence that's unrelated to them. While you don't get lower scores if you're highly creative or empathetic person, so it's not directly a detrimental for society and can be a useful metric for some cases like specific jobs, it's image as sole measure of intelect is manufactured to promote "specific kind of people", to which group many republican businessmen would belong.
I'm not disagreeing with what you said, just thought I'd expand on that.