I'm not sure how closely you follow the team, but a lot of the fans weren't been happy with the results after the WC extending all the way to early June and the players that Klinsmann had been using. Once we got a few wins in early June against Netherlands and Germany, most of the fans weren't as upset anymore, but those good results weren't important once we played terribly in the Gold Cup.
The Jamaica loss was really bad, but it wasn't just that result. The team didn't play well the whole tournament with many questions about player selection and tactics surrounding the coach, and we were actually lucky to get to the semi-finals of the GC. After that tournament, Klinsmann didn't want to take blame. He chose to blame it on bad luck and the referees, which didn't play as much of a part as he was saying.
The way you are analyzing the US National Team is from an outsiders perspective, and I mean that with respect. I wouldn't be able to analyze the German National Team from anything other than an outsiders perspective. Fan perception of Klinsmann has shifted in a big way recently. The fans are not happy with the job he is doing.