Because his ‘opinions’ were totally opposed to how the world actually works. His believing that how international diplomacy works isn’t right doesn’t matter.
If you don’t feel it is in the best interest of the US to give the rights of prosecuting war crimes to an international body (I disagree) then you should keep your signature on the treaty, and not remove it. Removing your signature from a treaty is a “thumbing your nose at others”. Hell, if it isn’t ratified, it isn’t ratified, fine. But just removing your signature from the treaty is a shit thing to do, diplomatically speaking. It shows no respect for the international consensus. We don’t have to pass it, but keeping our signature doesn’t mean that we are subject to the provisions.
And no, the fear mongering is the idiotic and ludicrous idea that American servicemen would be hauled in front of the court at a moment’s notice. That is just plain false, but has been repeated over and over. That is the argument against the treaty and it is fear mongering, nothing more.
‘We better not thumb our nose at the international community’ is sound advice. Seeing as we live in a commonwealth of nations, it is in our INTEREST to be civil to them. That means keep the signature on the treaty, even if we don’t ratify it. But making a big show about taking our signature off the treaty (same with Kyoto), is simply rude.
Since World War II, they’ve changed their tune A LOT. They are one of the most international countries out there, trying hard to accede to all international UN treaties it can. It has also been loath to send troops, even peacekeepers anywhere. If it hadn’t done a complete 180, they would have been pariahs. Hell, it took them long enough to be trusted in the first place.
All we are doing, it seems is saying we are the big kid on the block, so we are taking our ball and going home, instead of saying, ok, we don’t like this game, but since you guys are playing with our ball, we’ll just wait this game out and join in the next go around.