I'm not sure what you mean by "welcome" Kim into the family. Otto was in a coma when he arrived in the U.S. and his parents are witness to this. They were able to say goodbye to him. If this were a conspiracy, his parents are in on it, too. The reason why we have to tread carefully with Kim Jong Un is because he could murder thousands if not millions if we piss him off. Remember, Potus has more intel than we have. His sister is just as crazy, so we cannot just "remove" him. Bombing NK would kill innocent people.
Please explain further what the motive of this alleged conspiracy would be.