As much as I feel we should kill Kim Jong-Un, it's just not going to happen. There's big conventions in place that stop nations from killing each other's leaders. It's why we go through huge wars to overthrow leaders instead. We'd kill a million people before we'd put a bullet in an enemy leader's brain.
That won't stop this guy from using every possible way to justify the western world from being the great Satan, though. In his dogma, he is a god to the people of his country. If one of his citizens did make an assassination attempt upon him, that person will definitely be accused of being a foreign agent, as it being a true North Korean goes against the narrative that all North Koreans rightfully agree with and worship Kim Jong-Un.