Why are we here?

So late this evening, I thought of the possibility if I was unpatriotic "If you hate America so much, why don't you leave?" was the first quote that came to mind. I thought of the reasons why I was here and I realized that I wasn't actually being unpatriotic but just upset by some of the decisions that have been made by our government and our society as a whole. Many people I know say they hate America but the only reason why they stay is because of so and so excuse. Would you stay in a country only for it's advantages and nothing else? Similar to some foreign immigrants who come to America for a better life.