Because, as a nation/culture we suffer some delusions/biases

1. Every country needs to be run like the United States is run
2. The culture of a country needs to be identical or at least similar to the culture of the United States
3. Every one really, in their heart, wants to be just like an American
4. If some one/some government disagrees with us, they are wrong
5. If some one/some government hates the US it is because they are envious of us.

That's why we keep trying. It is a laudable trait, but often a futile or even dangerous trait.