Drawing such a sharp distinction between violent and non violent crimes omits many real-world factors.
What kind of criminal is this person is different from what was this criminal convicted of. I can be a part time drug dealer, shooting rival gang members, robbing houses and pimping whores. But land myself in prison for 10 years due to my 6th possession charge. If you draw a hard distinction statistically, I fall into the 'I can't believe we imprison people for having a little pot'
Additionally, what is a non-violent crime? Looks like good chunk of prison inmates are property crimes, larceny, burglars, thief. What percentage do you suspect of these non-violent offenders were armed during the commission of their crimes? What percentage would have turned violent if confronted during their crime? I suspect that these people who steal your car, break into your home and business and steal your things are effectively violent offenders.