I also am doubting if all the news about North Korea are true...
And it would be certainly wrong to kill all citizens only because one person threatens the world (if he does)
But no matter if the news about North Korean atomar weapons are true ore not, there is no doubt that this country has very little freedom. if your religion does not fit to the state you will be persecuted (maybe even killed) .
Therefore in my eyes there is no doubt that Kim Jong-Un should be somehow stopped, but we can not do it at the expenses of the life of thousands of Peaceful North Korean people...
Even the most evil dictator is no reason to share innocend blood.