Here's the irony here: you claim to be anti-war. However, if the US government buried its head in the sand as you advocate, the world would be in much much greater conflict and war than today. You're okay with China and Russia invading only their immediate neighbors? Which ones are you okay with? I assume Taiwan and Ukraine are to be absorbed and its people thrown in gulags in your world view. How about the rest of Eastern Europe? And then what do you think the rest of Europe and Japan and South Korea would do in the US vacuum? They would dramatically rearm, add nukes and every other form of warfare that they could develop to stop the invaders. But you think you would be safe in your bubble of American isolation that you advocate? Doubtful. Clearly the rest of the world would be in chaos and conflict. You'd really want that?
The only way to stop war is to encourage stronger countries from not invading smaller ones. It's that simple. How to do this? Make it too costly for them. Band together. Create economic and defense alliances that will encourage the big guys to avoid war. Russia would not have invaded Ukraine if it had been in Nato. If Nato breaks up, which is a very real possibility if Trump gets elected, Europe will be in war again. Russia wants the Baltics, Finland, Poland and other countries. Your positions are not anti-war.
You think "not getting involved" is the same as "burying its head in the sand". That shows just how good a job the war party has brainwashed the public into thinking the US should bomb anyone anywhere anytime lest the world descend into chaos without our "benevolent" leadership. It's easy to say "oh it is okay that we do it because we're the good guys", but I doubt the people getting bombed think we're the good guys.
I could go into detail about how all those threats you named are exacerbated by US involvement, but that is actually the wrong argument to make because it concedes your core point that involvement is justified but sometimes goes wrong. Still, it is true that those threats you named are exacerbated by US involvement.
You think the solution to peace it to have the US at war with everyone you think of as a "bad buy".