Thomas Sowell‘s latest column at Real Clear Politics laments the lack of intellectual rigor in debates over gun control.

Surely murder is a serious subject, which ought to be examined seriously. Instead, it is almost always examined politically in the context of gun control controversies, with stock arguments on both sides that have remained the same for decades. And most of those arguments are irrelevant to the central question: Do tighter gun control laws reduce the murder rate?

That is not an esoteric question, nor one for which no empirical evidence is available. Think about it. We have 50 states, each with its own gun control laws, and many of those laws have gotten either tighter or looser over the years. There must be tons of data that could indicate whether murder rates went up or down when either of these things happened.

But have you ever heard any gun control advocate cite any such data? Tragically, gun control has become one of those fact-free issues that spawn outbursts of emotional rhetoric and mutual recriminations about the National Rifle Association or the Second Amendment.

If restrictions on gun ownership do reduce murders, we can repeal the Second Amendment, as other Constitutional Amendments have been repealed. Laws exist to protect people. People do not exist to perpetuate laws.

But if tighter restrictions on gun ownership do not reduce murders, what is the point of tighter gun control laws — and what is the point of demonizing the National Rifle Association?

There are data not only from our 50 states but also from other countries around the world. Professor Joyce Lee Malcolm’s empirical study, “Guns and Violence: The English Experience,” should be eye-opening for all those who want their eyes opened, however small that number of people might be.

Professor Malcolm’s book also illustrates the difference between isolated, cherry-picked facts and relevant empirical evidence.