Maybe so from his personal perspective, but if it wasn't him it would've been someone else.

It's the knowledge that is the problem not necessarily the bombs themselves, and Oppenheimer was far from the only one with the knowledge. Today if we could snap our fingers and make all the nuclear weapons disappear, they would only re-appear in short time because we have the knowledge.

This isn't the same, imo, as say Nobel who created smokeless gunpowder and as a result changed connon, gunnery and muskets for all time. If Nobel hadn't come up with the idea we may have gone another century before having something similar discovered. Not so for the a-bomb, imo. Lots of people were working on the idea. It was only a matter of time, especially during the time in question.




Ahk

"But I found him unique in that he had an important part of history and he seems to regret his part in the atomic bomb process. "

He probably does wish it was someone else, even if he recognizes it was destined.

Despite the bomb, the work done on the Manhattan project has lead to many other discoveries too, like nuclear energy. Like others have said, it was inevitable that the bomb would have been discovered, and I think using the bomb in Japan probably helped stop a nuclear exchange during the Cold War. Nuclear weapons are terrible things but I think in the long run humankind will be better off because of the good that nuclear technology can bring us.