Of course US does. We really need to acknowledge that. Don't believe it? Support US withdrawing from mutual defense pacts with South Korea and Japan and NATO.
I wouldn't support the US reneging on its current security agreements, particularly with Japan, since we forced them into their current pacifist regime, but if South Korea, Japan and/or NATO wanted the US out, I wouldn't oppose it.
I'm afraid there's a point at which America's overwhelming military, cultural and political dominance itself becomes a problem. Even if one can argue that, as hegemonies go, you could do worse, superpowers and their chess games are also holding the world back.
Why? If US does nothing for their security, then there's zero point of US spending money on it. It is like code - if the line is NOOP, then it should just go.
If the US has treaty obligations that require its military engagement, then those need to be upheld, or else the US should try to renegotiate them. Otherwise, even if the security situation is made worse, the US should respect other countries' sovereignty if they want them gone.
Because of Pax Americana, most people can't even grasp the concept or seriousness of, say, a neighboring nation dropping bombs on your city just because they want your territory. The US is insulated from such concerns, Europe is rife with them :)
Because of “Pax” Americana, many people have a vivid and direct understanding of a remote nation dropping bombs on your city because they aren't satisfied with your internal politics, even though they don't want to be bothered with the general burden of governing the territory.