Terrorists don't drop pamphlets for days telling civilians to evacuate you PoS.

You think those cities were just civilians? Wrong

Hiroshima was the headquarters of the Fifth Division and Field Marshal Shunroku Hata's 2nd General Army Headquarters, which commanded the defense of all of southern Japan. It was also a communications center, a storage point, an assembly area for troops, and was a military-industrial center powered by the mass-scale forced labour of Koreans known as hibakusha. The Hiroshima island of Edajima hosted the Navy Elite Academy. Kure, around 20 km from Hiroshima, was also known for a military port and navy factories. The famous giant warship, Yamato, was constructed in Kure. The material and labour for Kure came from Hiroshima.

Nagasaki was one of the largest sea ports in southern Japan and had wide-ranging industrial importance. Ordnance, ships, military equipment, and other war materials were manufactured there. The Mitsubishi Steel and Arms Works was located there. Mitsubishi produced over 10,000 Zero fighters and the battleship Musashi.