Here's why I disagree (also not from the US).
If you look at actual history, World War 2 happened exactly because some countries were unwilling to defend other countries, and let the Germans effectively try to conquer Europe. From a game theory perspective, you really, really want to pre-commit to not letting other countries do things that will cause war. So you pre-commit to protecting allies and other countries against e.g. Russian aggression.
The years of the cold war, while hard psychologically, were relatively peaceful, exactly because of these pre-commitments and threats to use force.
I think it's wishful thinking to assume that the world is at relative peace, and that can't change. That's not the default state of the world. And without knowing a hell of a lot more about international politics than I do, I'd be incredibly remiss to throw out the current establishment and say "yeah let's bring in someone new who wants to rewrite the rules". The chance that things will be worse is huge - that's what usually happens when you change things.