Obama Will Visit Hiroshima to Push for World Without Nuclear Weapons (Morgan Chalfant  , May 10, 2016, Daily Beacon)

It's hard to think of a worse place to try and make that argument.  Even setting aside that, with a population of over 1 million people, it demonstrates that nukes are fairly limited weapons, the bombing ended WWII, saved lives and ended a brutal regime.  If anything, it stands for the efficacious use of nuclear weapons and is an indictment of our failure to use them subsequently to similar effect.