Our prisons are crowded with people who shouldn't be there, the victims of a racist justice system.

This is the popular progressive narrative, but it's wrong in every respect. Dangerously wrong.

The US does have a very large prison population, not because too many innocent people are incarcerated, but because too many people commit serious, usually violent crimes.

With rare exceptions, that's why most people are imprisoned in America. Period. Full stop.

Before presenting the facts, let me add these caveats. It's unacceptable that any innocent person is behind bars.

Punishment must always fit, not exceed the crime. We should do everything we can to reduce the rates of recidivism, committing more crime after release.

And finally, everyone in prison should be treated humanely. But let's not fool ourselves that our prisons are full of people who shouldn't be there. That's simply not the case.

Let's start with those convicted of drug offenses, the source of so much of the mass incarceration myth.

While it's true that about half of federal prisoners are incarcerated on drug charges, federal inmates constitute only about 12% of the American prison population.

Almost nine of every 10 prison inmates are in state facilities, and very few of them, less than 15%, are there for drug-related offenses.

Four times that number are behind bars for one of the following serious crimes. Murder, 14%,

rape, or sexual assault, 13%, robbery, 13%, aggravated or simple assault, 11%, and burglary, 9%.

In short, violent criminals make up the clear majority of the state prison population.

What's more, drug offenders who do end up in prison don't actually serve very much time, almost half are released within a year.

The truth is that most criminals probably spend less time in prison than you think, even for the most violent crimes.

According to the Bureau of Justice Statistics, almost 40% of released state prisoners served less than a year in prison.

Even 20% of murderers and nearly 60% of those convicted of rape or sexual assault served less than five years of their sentences in prison.

What explains the short stays? Answer? Plea bargaining.

Most prosecutions never go to court. Instead, a deal is made between the defendant's attorney and the prosecutor to avoid going in trial.

These negotiations often involve the offender agreeing to plead guilty in exchange for a reduced sentence or dropping or downgrading the most serious charges.

As a result, a prisoner's conviction record often understates the crime that landed him behind bars in the first place.

For example, an armed burglar, who, when arrested, was found to be in possession of illegal drugs, might go to prison not for his worst crime, the armed burglary, but for a plea bargain charge of, say, trespass and drug possession.

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