Republican and moderate Dem politicians support the genocide, because Israel pays some people to support them, and pays for the campaigns of some people who already support them.
The American people largely dont support Israel's actions, we just don't get a say in our government anymore thanks to money in politics and primaries not being binding elections and open to manipulation.
Actually, American public sentiment polling indicates that double the amount of people support Israel in the current conflict than do Palestinians. Source
This is standard response level for "unsure." It sucks, but the public writ large is supportive or unconcerned with how Israel is prosecuting this war.