DPRK Not to blame for breakdown of DPRK-US negotiatons

So the US is trying to shift the blame onto the DPRK for the apparent breakdown or stalling of the DPRK-US negotiations . Why should the DPRK be blamed for the irrationality and insanity of the US ? It was the US that abruptly cancelled Pompeo 's visit to the DPRK . There is talk of a letter alleged to have been sent by General Kim Yong Chol , vice chairman of the Workers' Party of Korea but no one has actually seen this letter. The US media have contradicted themselves by saying on one hand they do not know the contents of the letter but on the other hand it says that the DPRK will resume nuclear and missile activities . All sounds like typical Yankee BS if you ask me