Firstly, they are the only instance of nuclear weapons being used on people. Secondly they are, by any measure, even by the standards of WW2, massive atrocities

Firstly, they are the only instance of nuclear weapons being used on people. Secondly they are, by any measure, even by the standards of WW2, massive atrocities. 60000 people killed in an instant, an entire coty destroyed and of course the radioactive aftermath. The survivors experienced pain so great they begged nurses to kill them.