You mean Saddam Hussein (Iraq) and the Taliban (Afghanistan)?

But yeah, I definitely think we should have acted much more forcefully to end the wars much more quickly and with far fewer casualties on both sides.

I think we probably could do this without resorting to nukes, but applying the same "kind" of intense pressure. Hiroshima/Nagasaki were huge successes compared to a minimum decade-long ground invasion and occupation of Japan resulting in possibly millions of deaths.