Good or evil in this case doesnt really matter. The key was consistency. America had been a world stabilizer for almost 100 years(even if the world stabilization was achived by destabilizing other nations). The world relied on that concept for global trade and the markets that brought with it.

That illusion is now shattered. The world knows its always a 4 year election cycle away from complete chaos. The trust to be earned back will take as long as it takes for humanity to forget. And it would also require us to be stable for that ammount of time. This means a minimum of the lifetimes of the people currently alive and possibly never.

But i am betting it never recovers to the same degree. America isnt the same power today as it was when it gained its place in the world. And China / europe are more powerful now than they were in the 50’s. We are no longer a world leader in education, manufacturing etc. Its possible we could speed up the recovery with some political changes to the system, but i dont have much hope for it. It would require the people in power doing things agaisnt their own interests.