In this case, the US and Israel were never parties to the ICC, so the ICC was never neutral with respect to them. If they had submitted to the ICC, I think your point would be valid.
A lot of Americans believe that power is winning. There's a fight, and the side that wins is the more powerful one. But true power comes from not having anyone question your decisions, such that there is never a fight in the first place. And that's the dynamic I'm commenting on. Eisenhower was a powerful president even though he started no new wars (indeed, he ended the Korean war). With 70%+ approval ratings domestically and unquestioned economic supremacy abroad, he didn't need to.