True, but it's more difficult to kill people with rocks compared to a nuclear missile.
with nuclear missiles, we have seen what we wrought.
It's a sticky issue--the presence and threat of nuclear warfare is a terrible thing; yet it truly is an effective deterrent.
Go back through the history of warfare--battles were bloody; you'd have tens and tens of thousands of dead per day.
I believe it was one of Sala ad-Din's battles during the Crusades that saw the largest casualty rate in history--roughly 500,000 dead in one day?
While it is true that the development of guns have made warfare less personal, and theoretically more bloody because of this, the opposite has proven true. We have become more efficient at killing, and while WW2 saw the largest total waste of human life the world has ever known, it was ended with a stark judgment with what we have done to ourselves, and what we can do to ourselves.
That potential in mind, and its threat very real, we have been given pause time and time again in very volatile regions--far more volatile than the great nations of the 19th and 20th centuries--with very little bloodshed, comparatively.
remove those nukes and you have very little restraint.