Any forum with a large group of problem-solvers who are discussing a problem are going to have a larger-than-average number of people announcing all kinds of terrible things.

Put another way, some Americans just love complaining about America.

We're a country of 330 million people, spread out the length of an entire continent. Name a problem, and somewhere, someone has it. No place you go to has every problem, and I imagine most places you go the average person will have more good than bad to say about where they live.