There is a more practical reason for not boosting the egos of North Korea's leaders and that is that every agreement they have signed on to they have broken.  They are even better than Donald Trump than lying.  Trump achieved nothing but vague promises in his meeting with Kim, but the the latter got everything he wanted including a promise that the US would end the war games with South Korea.  What did the US get?  Essentially nothing so far.
		
		
	 
Well, Trump got his photo op.  Image   and world wide attention on that meetup.......would  be priority for him.  It goes into his brag book  of self congratulations.  
But tat is ALL  he really got........as that so  called statement"  is a series of words   without substance.......
And it is NOT as if NK  did not WANT  a meetup with him for their own   propaganda  motives   Again.....Tramp gave the what they anted. the question is  how will they  go about getting more items on their  wish list.
(again.......no problem  dealing with a leader who has a despicable  record of human rights abuses.   Not the slightest concern for trump