They don’t. They care about keeping this from escalating into a very dangerous regional conflict with the potential to spread further. Israel is absolutely justified in going after Hamas. What they are actually doing is beyond what a reasonable response would look like. Nobody besides the bad guys cares if Israel goes and kills some terrorists, but they can’t displace a million people who had nothing to do with it and then starve them out. In a matter of days, Israel went from being the victims of a heinous attack to committing war crimes on a massive scale. That can’t be. It makes it hard to support Israel and we also can’t turn our backs on an ally. It’s an untenable political situation for the U.S. and risks a major conflict. The U.S. is serving its own interests.