What about the approval of his countrymen? We (the United States) do not necessarily agree with everything that Angela Merkel or David Cameron does, but they remain in power. And there are countries without nuclear weapons and missiles. We may not agree with everything that Luis Guillermo Solís, Juan Carlos Varela, Ellen Johnson Sirleaf or Ernest Bai Koroma (none have nuclear weapons, ICBMs and all were popularly-elected) do, yet they stay in power and there is no threat to their position from the United States or from other countries.
The idea that you have to "rattle a saber" in order to stay in power is foolish. Only despots have to develop a system of force to gain, consolidate and remain in a position of power. And that is what makes North Korea not funny.