[…] On a per-capita basis, the Korean War was one of the deadliest wars in modern history, especially for the civilian population of North Korea. The scale of the devastation shocked and disgusted the American military personnel who witnessed it, including some who had fought in the most horrific battles of World War II.
World War II was by far the bloodiest war in history. Estimates of the death toll range from 60 million to more than 85 million, with some suggesting that the number is actually even higher and that 50 million civilians may have perished in China alone. Even the lower estimates would account for roughly three percent of the world’s estimated population of 2.3 billion in 1940.
These are staggering numbers, and the death rate during the Korean War was comparable to what occurred in the hardest hit countries of World War II.
Several factors contributed to the high casualty ratios. The Korean Peninsula is densely populated. Rapidly shifting front lines often left civilians trapped in combat zones. Both sides committed numerous massacres and carried out mass executions of political prisoners. Modern aircraft carried out a vast bombing campaign, dropping massive loads of napalm along with standard bombs.
In fact, by the end of the war, the United States and its allies had dropped more bombs on the Korean Peninsula, the overwhelming majority of them on North Korea, than they had in the entire Pacific Theater of World War II.