I don't hate "Americans". I condemn stupidity, and consistently stupid people.
Unfortunately for the people of America, and indeed, of every other country, there are stupid people included in the set of people "Americans" or whatever other country we're discussing.
It's all math.
P(S) = Probability of a stupid person.
P(A) = Probability of an American.
P(SA) = Probability of a stupid person who is American.
P(SA) = P(S) [binary AND] P(A)
As we add more people, both P(S) and P(A) increase, so therefore too does P(SA).
When the set of people is in the millions, or billions, as it is on Earth, P(SA) will be 1.
You can be sure that it's also going to be true for any given country, not just America.
I'm Aussie, and I loathe many Australians.
It's all probability and set theory.