In the Korean Peninsula the North Korean state clearly views every American move as a possible precursor to an attack. The same is true of the South Korean, Japanese and Taiwanese Governments and their ally, the US. Given the history of the Korean War this is hardly surprising; a popular Socialist interim-Government was attacked by an American backed anti-Soviet force and much of the Peninsula was laid waste.
Given that the USA had begun reducing it's presence in Korea prior to the war and in the early stages they and the South Korean forces were nearly driven off the peninsula it seems hard to come to the conclusion that they attacked the North.
I'm not sure what evidence there is for believing that the NK regime was initially popular either.