Bobby
Had they not surrendered it would've been completely justified to hit another target. The casualties of an invasion of the main islands would've been far worse for US forces than the bloody taking of Okinawa. Besides the radiological contamination ,was the nuking of Hiroshima and Nagasaki really any worse than the fire-bombing of Tokyo or Dresden ?
And to relate this to the topic at hand. Would the locals be better off if the contaminant was lead particulates ? Lead in Paint, Dust, and Soil | Lead in Paint, Dust, and Soil | OPPT | OPPTS | US EPA