The pursuit of perfection means focusing on where things can be improved. Do liberals do this too often? Sometimes. There's definitely a segment that scoffs at the U.S. the way you say, and they are idiots, just like preachers like Falwell calling us the home of the wicked are idiots. Forgive us if we don't spend enough time appreciating what we have, but I hope you recognize that we are driven by a belief that we can be better (definitions on that, of course, vary), and that is not a bad thing.