The American government as with all capitalist governments is run by and for the owning class. Notice how our elected officials are property owners and business owners. They typically have a lot of investments in large business etc etc. So it follows that they would run their government in a way that would protect or bolster their investments. Whats good for business is good for them. This is why the "economy" and GDP are so talked about in our politics, its incredibly important to our elected officials and our unelected officials such as CEOS that the businesses they have invested into continue to turn a profit. Businesses will lobby and bribe politicians for laws that work in their favor and our politicians do it because it is in their best interests to do so. This extends beyond just maintaining a low minimum wage, refusing to pass rent control laws, cutting welfare, keeping privatized healthcare, loosening child labor laws, bailing out failed businesses, and writing loopholes into our tax laws that allows the owning class to evade them. It is also the reason the US overthrows democratically elected governments, invades sovereign nations, and funds far right insurgencies. Ultimately every single decision the US makes can be boiled down to protecting the interests of the owning class.

So, both the Democratic and Republican party have essentially the same interests. The main difference being that the Democratic party gives a few more concessions to the working class because it needs to maintain a voting body and it knows that pushing workers to hard can cause a revolution. It wants to extract as much profit as possible without risking a loss of power. The Republican party just does a little more for the owning class and a lot less for the working class.

Voting for the left most party no matter how far right they actually are because the other party is worse shows them that they can maintain their power and capital while doing less and less for the working class. Why should the Democratic party give you free healthcare, free education, a better wage, less working hours, or better working conditions if you're gonna vote for them anyway. The far right republican is an incredibly useful tool for the Democratic party because it means they can maintain their position of power without actually doing the things you want them to do. Hell they even fund them. As for foreign policy, there's little difference between the parties. They both know they can get away with bombing millions of innocent people bc wtf are we gonna do about it? Vote harder? For who?

As for israel specifically, im hoping that the Democratic party is worried enough about losing their executive power that they stop comitting a genocide but I truly honestly doubt it will happen. AIPAC is a very powerful lobbying group and the ruling class who benefit from the existence of Israel know that they can get what they want regardless of who is elected.