On a world scale, a lot of them are (or were).
How many people were "disappeared" in Chile under Pinochet, or Argentina under what's-his-name? Take a look at Venezuela under Chavez, or any of a number of African countries. Sadly, human nature hasn't evolved very much in several thousand years.
What the true believers don't understand is that if there weren't a United States with a 2nd Amendment and a bunch of patriots with boom sticks, the world would be even worse than it is.
When you say the United States I hope you are referring to the Constitution, not the actual Government. The US Federal Government has been cozily in bed with every form of monster out there at one time or the other. At present it is trying very hard to become one itself as evidenced by the complete trashing of the Constitution.