I don't think this is the right place for such a debate, but if you google "did the atomic bomb save lives", you'll find people that make the case that it was the right choice.
I suspect the response to your "why not?" would be that we haven't had any war since then where the threat was significant to warrant the horrific impact of their use (which nobody seems to deny). Plus, ever since shortly after WWII, there was always the possibility of nuclear weapons triggering a nuclear response.
I suspect the response to your "why not?" would be that we haven't had any war since then where the threat was significant to warrant the horrific impact of their use (which nobody seems to deny). Plus, ever since shortly after WWII, there was always the possibility of nuclear weapons triggering a nuclear response.