If the USA is evil, why doesn't the world unite to destroy it?

And then exterminate the whole population so that there will be no more evil?

Biggest question and mystery of my life.

I have pretty much come across all the complaints that the world has about it: it's a warmonger, it bombs countries, it kills innocent people, it's racist..... everything.

What I do not understand is why does the world let it continue to exist?

And when it does something bad, people all over the world will condemn it, just as usual but again, nobody will try to do anything about it..... why?