While I agree that comparing Obama to Hitler is WAY beyond extreme, it's not too far fetched to believe that our government could turn on us. It may not be immediate, but a series of events that over time makes the government tyrannical. Now, keep in mind I'm not saying the government is or will become tyrannical, only that it always could become so. It's not far fetched to believe that the people could overthrow the government. The military or parts of it may agree with the people and either fight with them of simply stand down and refuse to fight. I don't see the government being willing to use bombs and other explosives on their towns, cities, and non-rebelling citizens. Plus, the sheer prospect of a full on rebellion could frighten the government into giving in.