I think that's human psychology[0], not necessarily specifically American. Either way, I think that the people most likely to say the things in your first paragraph are also much more likely to consider the "bad stuff" you're talking about as "good stuff" and brag about that as well.

American voting systems are bad. Average Americans have minimal influence on the policy that's enacted[1]. I wonder if where you are from these don't apply as much, and you are used to having more control over what the government does.

[0] https://en.wikipedia.org/wiki/Fundamental_attribution_error?...

[1] https://pnhp.org/news/gilens-and-page-average-citizens-have-...