I'm not American but I do believe in the right to revolt against despotic government. I know about various abuses and wars of the US government which are common knowledge. There are at least a couple of reasons why Americans have not risen up against their government:
1. The conditions of life for the vast majority of Americans is far better than would be had in a civil war.
2. If you had enough people to win a revolution you could just win an election instead. You can complain about a rigged election system all you like but what proportion of the population do you need to win a civil war? If you had that many people turn up to vote instead of fight you could get your changes without getting killed.
Believe it or not, not all people who believe in the right to revolution are some sort of trigger happy crazies just looking for an excuse.