It is humiliating, but that makes no sense at all from a power dynamics perspective. Israel is just not that powerful, economically, militarily, or socially. The US's military industrial complex is, and basically every politician is beholden to powerful capital interests, the MIC among them. Unconditional and enthusiastic support of Israel, then, is a proxy for support of those financial interests, hence the visits, deference, etc. This backed up by the very real threat of a handful of powerful lobbying groups that will and have coordinated to redirect funding to opponents of anyone they deem insufficiently deferential.