It is more like the trolly problem, one is bad, the other is much worse. The difference is that whether you're a fan of a football team or not it does not affect the outcome, but voting does affect the outcome albeit marginally.

Being pro-palestine is not the definition of the left, the truth is things would only be worse for Palestine if Trump is elected, and in exchange for this punishment of the Dems the potential losses are immense and not just for Palestine. Being pro-palestine is very popular among the far right as well, and they are cheering for Trump just the same as you have been implicitly.