define threat any way you want, I'd agree with all of them including a government that abandons the principles of the constitution. or the law including the Posse Comitatus Act. What would prevent Obama from ordering federal troops into the states under some bullshit reason for martial law? Posse Comitatus is supposed to but what really would? the right to bear arms.
http://en.wikipedia.org/wiki/Posse_Comitatus_Act
LA riots? which one? Watts? that was a mob who overreacted to a lawful arrest, because The Man (white cop) arrested a drunk black man, who should have been arrested. racist had nothing to do with it but the black population in Watts thought it was a racist arrest when it was not. and what did those idiots do? they burned down their own neighborhood! if they really wanted to stick it to whitey they should have burned down Beverly Hills. of course the wonderful Fed Gov spent zillions to rebuild the area. unfortunately 100 years after the Civil War (which really by the way had nothing to with slavery directly it had to do with State's Rights vs. the Federal Government, one of those rights was the right to slaves in the south) there was still racial prejudice of the population, but the government had nothing to do with it. Quite different than say Hitler rounding up Jews or the Chinese arresting dissidents.
http://en.wikipedia.org/wiki/Watts_Riots
Free countries do impose their will. by enacting laws by elected representatives of the people. or at least that's how it's supposed to work. a vastly different thing than imposing censorship, repression, freedom of speech, etc.
no we didn't invent capitalism nor did the Chinese. a Brit did. John Maynard Keynes. and Keynesian economics is not really capitalism, capitalism is simply based on the principles of Keynesian economics.
http://en.wikipedia.org/wiki/Keynesian_economics