Charles Krauthammer has written it. Excerpts:

I have no problem in principle with gun control. Congress enacted (and I supported) an assault weapons ban in 1994. The problem was: It didn’t work. (So concluded a University of Pennsylvania study commissioned by the Justice Department.) The reason is simple. Unless you are prepared to confiscate all existing firearms, disarm the citizenry and repeal the Second Amendment, it’s almost impossible to craft a law that will be effective.

Feinstein’s law, for example, would exempt 900 weapons. And that’s the least of the loopholes. Even the guns that are banned can be made legal with simple, minor modifications.

Most fatal, however, is the grandfathering of existing weapons and magazines. That’s one of the reasons the ’94 law failed. At the time, there were 1.5 million assault weapons in circulation and 25 million large-capacity (i.e., more than 10 bullets) magazines. A reservoir that immense can take 100 years to draw down.

More:

Monsters shall always be with us, but in earlier days they did not roam free. As a psychiatrist in Massachusetts in the 1970s, I committed people — often right out of the emergency room — as a danger to themselves or to others. I never did so lightly, but I labored under none of the crushing bureaucratic and legal constraints that make involuntary commitment infinitely more difficult today.

Why do you think we have so many homeless? Destitution? Poverty has declined since the 1950s. The majority of those sleeping on grates are mentally ill. In the name of civil liberties, we let them die with their rights on.

A tiny percentage of the mentally ill become mass killers. Just about everyone around Tucson shooter Jared Loughner sensed he was mentally ill and dangerous. But in effect, he had to kill before he could be put away — and (forcibly) treated.

Random mass killings were three times more common in the 2000s than in the 1980s, when gun laws were actually weaker. Yet a 2011 University of California at Berkeley studyfound that states with strong civil commitment laws have about a one-third lower homicide rate.

Read the whole thing. Krauthammer concludes that the only truly effective things we may do to stop spree killings require very serious tradeoffs in constitutional liberties. If we are going to do any of those things, we ought to ask if they will work, and if they work, if they will be worth the tradeoff. Think, for example, about the kind of government we would have to have to confiscate and destroy all the weapons already in private hands.