South Korea is a military puppet of the Pentagon. It is a economic vassal of America. They know it. 

U.S. have installed massive military forces in SK. The most massive in the world outside of Japan, a former defeated enemy. One understand why for Japan, but why for SK? Because U.S., by its intervention into Korean affairs in 1952, and not able to win the war, is an enemy of the North. North Korea have not drop a single bomb in the U.S. so why the U.S. killed 3 million of them? Answer: ideology. In the 20th century, the U.S. have been a conquering empire of ideology. It want to defeat any country whose ideology it does not like. This is also the basis for the Vietnam War - the U.S. did not like their ideology. The war killed 3 million Vietnamese and Cambodians. Add these two up and you have 6 million Asians died because America does not like what they think .

In comparison the Nazi killed 6 million Jews also because they didn't like what they think.