Many of these "non-violent" offenders have blood on their hands. Many of the drug addicts you feel are not a threat to society often times become dealers to support their habits and end up pushing drugs on kids to continue the cycle of death. Take a look at all of the other crime that goes along with it. My cousin was killed by a "non-violent" drunk with four prior DUIs. It is better when a number of these individuals are in prison and not around their kids. I know of one of the early releases that the governor put back on the streets and the guy is worthless. He is constantly getting high around his kids, is a terrible father, is back using and selling drugs and it is only a short time before he will find his way back into prison. Hopefully his wife and kids don't get dragged in with him or caught in the crossfire of a drug deal or drug bust gone awry.
Heck, many of these police shootings that BLM and others protest stem from people's erratic behavior while using drugs and alcohol (George Floyd, Rayshard Brooks, etc.), and association with those involved in the drug trade (Breonna Taylor). These individuals pose a threat to their communities and those around them. If you feel that drug addicts and DUI offenders are not a threat, then move to Oregon or Portugal.