It undermines the idea of the U.S. as a neutral arbiter for law, order, and free commerce. That may always have been a fiction, but it's a very useful fiction because it underpins U.S. soft power. It's much easier to get consent for being the world hegemon when you act like a benevolent, disinterested hegemon. Once you start becoming a participant - and overriding other institutions that are ostensibly providing neutral, impartial justice just because their decisions are inconvenient for you - you are essentially placing yourself below them and undermining your own legitimacy.
Neutrality and objectivity may be a fiction, but it's one of the most useful fictions that have been invented in the last 500 years.
Neutrality and objectivity may be a fiction, but it's one of the most useful fictions that have been invented in the last 500 years.