Japan was already seeking surrender even before the first bomb. They were ready for almost unconditional surrender, with their only condition being immunity for the emperor. The USA wanted full unconditional surrender and also to keep USSR from the negotiations, so they dropped the bomb. Then they dropped the second bomb, even though Japan tried to surrender again after the first one. I would say this counts as a lie when people say Hiroshima and Nagasaki were in any way necessary to bomb. The war was won at that point.

I think creation of nukes is a more complicated topic, but both their detonations were only done to force Japan to surrender 1)unconditionally and 2)to USA. IIRC even US command admitted it.