Isreal is the US's stronghold in the Middle East. It allows the US military to have North Africa, the Mediterranean, the Balkans, and so on all within striking distance of its aircraft. With this wide area of influence, the US can control shipping lanes, airspace, and natural resources in the region. Most of these resources are funneled into Europe (oil, heroin, lithium, cobalt, water, etc.). Western European capitalists can then rake in huge profits because nobody in the region can stop the US from stealing their shit.

Isreal exists so the Imperial Core doesn't have to do a D-Day/Normandy -style invasion anytime a group of people gets the idea to keep their nation's resources for themselves. They can squash any potential revolutions or labor movements without having to spend more resources than necessary.

Because of the looming threat of Israel's neighbors tossing them out, Israelis enjoy privileges and protections Americans don't. They want Israelis to stay in Isreal to guard it, not run back to Europe. Americans are under no such threat, so the US doesn't give a shit if there's suffering at home. It would be different if the USA's neighbors were trying to expel Americans out of North America and American minorities were engaged in armed resistance with help from foreign governments.