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Honestly I suspect it would do the opposite, Lemmy is a bit of a echo chamber and while users here heavily skew towards favoring Palestine in this, or at least condemning what Isreal is and honestly has long been doing to them, the US as a whole, even the base of the democratic party, has long been at least mildly friendly towards Isreal, and a large fraction will see Hamas's attack as justifying Isreali action. It's a bit of a damned if you do, damned if you don't situation for the dems I think where their current path angers progressives on the left, and actively sanctioning Isreal would probably anger the more center-right side of the party, and they need both to turn out to win. They probably figure that at the end of the day, the left either is mostly younger people that don't vote as reliably, or will bite their tongues and vote for them, because, well, if you're given only two possible futures, both evil, and a choice between them, one has a moral obligation to choose the lesser evil, no matter how evil that lesser is, just because by definition, the greater evil is worse. But the center-right, they probably figure, probably don't care about what is happening as much, and will feel much less uncomfortable about just voting for the republicans instead if the dem candidate doesn't do what they want.

That being said, it doesn't really much matter, ethically, if not helping kill tens of thousands of innocent people makes it slightly harder to win political power for yourself, it's still a pretty horrible excuse. Nobody sitting in a jury would let someone go free if they were accused of being an accomplice to a murder, if that accomplice's defense was "well, I'm running for mayor, and if I didn't help the murderer, his friends probably won't vote for me". Like I get that Kamala isn't really calling the shots on that, being only vice president currently, but she doesn't seem like she intends to change how Biden has handled the situation much.

Don't get me wrong, I am voting for her, I'm not one of those people that thinks that it is somehow noble to just let the greater evil win if it means not taking an action that helps the lesser evil beat it, I think that the going for the best outcome plausibly available is always the right thing to do and that doing the reverse because "well my hands are clean" is a misguided and self centered way to do ethics, but like damn people (to which I mean the people that actually side with Isreal in this, and the DNC I guess, not they they see my tired internet ranting), just because the other option is as close as the country has come in a century to "literally Hitler" does not mean that you have to emulate Churchill refusing to help the Bengalis.

It would help with a base that doesn't reliably vote even in countries where they have more political options available to them.

In the population in general more people support Israel than Palestine, especially amongst older electors that actually show up to vote.