OF COURSE it was right to drop the bombs ! We were AT WAR with Japan then !
Anyone believe Japan wouldn'ta used it if they'd had it ?
The first firebombing of Tokyo killed more people than either nuke, only it didn't leave any lingering radiation behind.
HOWEVER...
We were more-than-generous with Japan after the war. It began very shortly after their surrender when Nimitz told his admirals to not call then "Japs" or "Nips" any more. (Japan calls itself "Nippon".) and MacArthur was very firm but very fair as Shogun. He immediately began making every effort to get adequate food to all Japan, & set decommissioned military men to work building homes, cleaning up bombing rubble, distributing food, clothes, & medicine. We supplied materials for the rebuilding of Hiroshima & Nagasaki soon as the decrease in radiation permitted. And the occupying military was almost always courteous & fair, with very few crimes committed against the people.
The US was responsible for the rapid rebuilding of Japan, but it took somewhat longer to rebuild Germany, maybe because it's larger & had more people.
No large nation was ever forced to surrender in war & then treated as fairly as Japan was treated by the US !