Ah, so because people don't like Bush or his policies, that means they hate the US and its people too? Actually, most people don't think that way, but US citizens often get jumpy and picky if anyone disagrees with anything done or said by one of their people or politicians. "What? You don't like one of our politicians? How dare you hate our entire country like that!"
Anyone in a democratic nation would be offended, if you diss their leaders. A democratic ruler is chosen by the people, for the people. They support him - without such support, he'll go down. Therefore, when you criticise the leader, you criticise the people, questionong their integrity, intelligence and understanding. Wouldn't you be angered at that?