That's a ridiculous analogy, and you should be ashamed of yourself for even bringing it up. Please try to think of something a bit less hyperbolic in the future.
If you interests are bigger than your morality, you are in a very dangerous place.
Unless you are prepared to argue that we are able to enforce our morality in all places and at all times, we will necessarily have to pick and choose among those we will support. I assign no special criteria to Israel in that regard - when it is in the American interest to support Israel, we should support Israel, and when it is not, we should not. I assume that the Israelis regard their own allies in this fashion as well - if they do not, they would be wise to start.
We elect a government here in America with the goal of advancing American interests, not Israeli interests - that is what the Israeli government is for. When and where advancing Israeli interests proves felicitous for advancing American interests, the American government should advance the interests of the American people by advancing the interests of the Israeli people, and where it does not advance American interests, the United States should not advance Israeli interests. I also assume that Israelis regard their own state interests in a similar fashion here as well - if they do not, they would be wise to start.
Aside from the US, Israel is the only nation willing to what is right without being prodded by someone else.