Because the way the US treats other nations. For most of its history, it has been a war. It bullies other nations, interfere in their democratic process, when it doesn't invade them, or suspend their constitution or fund fascist paramilitary death squads to destabilise them. It could strike and annihilate Denmark tomorrow; a lot of Americans would cheer.
The US is very similar to the french Empire after the 1st Republic. It cloaks itself under the name of Republic, but isn't one itself. It's an evil country ran by evil people. The only difference is that Americans get to chose the Emperor every 4 years, whilst knowing no matter who is in charge, very little will change.
Of course its people aren't inherently evil or anything. But the propaganda is intense and permanent, so Americans unfortunately behave like little emperors themselves. This applies to most of Europe too, naturally.
That's why sometimes, I wish to pray to a higher power to spread class consciousness to the whole masses of America and Europe, but am also aware I'm part of the issue, and that it's wishful thinking.