I wrote out a long reply, but it all segues away from the original post in ways I'm not comfortable with.
I'll just say I probably don't think there have been as many political misadventures as you do. The problem is we're an isolationist country at heart who found itself the most powerful nation on earth, run by elites who saw US intervention as important and necessary with a general population that doesn't really care about what happens in Canada and Mexico, much less anything farther away. The general voters didn't even really want to get directly involved in World War II until after Pearl Harbor.
There are also a lot of fair criticisms of this country, just like there is with any organization that's extremely powerful. Being powerful means making mistakes, because there are things you can do that others can't, and there are things you choose not to do that you could have. That's not the issue with the powerless.
But if a society lacks conviction, it becomes hard to do difficult things, regardless of whether it should or shouldn't be done. Part of what creates that conviction is a pride of identity. Currently it's challenging to teach about having a pride of identity, because there's an important focus on what we should not be proud of. It can be difficult for people to hold both concepts simultaneously.
In any case, I love the original post. It's an important battle to talk about.
Richard Pryor had a segment in his standup routine in the 70s (I tried to find it on youtube but couldn't) where he talked about the reason why Japanese attacked Pearl Harbor is they were only acquainted with laid back west coast Californian Americans. They didn't know about the Deep South Americans. He didn't mean it as a completely serious comment, and I'm not quoting it as one. I did think it was funny, even when as often was the case with Pryor there were multiple meanings behind it.