NK is stripped to bare bone when it comes to economy and social situation in general. It is flat-out broke. In comparison, U.S. is still better off and could take some years before it reaches the level of collapse in N. Korea. On the other hand, U.S. citizens are used to much higher living standard. State control is weaker and access to information is much better, comparatively speaking. This all means that U.S. citizens have much lower tolerance of abuse.
It is possible that large revolt(by some elites or people)could occur in both countries about the same time.:-)