Smart observers will realize this saga is a story about the effectiveness of modern media at distorting reality. Americans aren't just magically, uniquely shitty people. We had a coordinated disinformation engine, truly a superweapon, trained on our population for a long, long period of time.
Shit works pretty great, and the world will see more of it.
Edit: strongest bit of evidence is probably just how the target group got their world views completely rewritten. Hard to really document properly, ya kinda just have to witness the dramatic shift firsthand. People got reprogrammed within a single generation. The same folks who raised us on "two wrongs don't make a right" and "treat others how you want to be treated" behave completely unrecognizably today. The disinformation engine is so effective they were tricked into completely rewriting their own internal values.