Simple. Abolish life sentences. Anyone with a life sentence or something that is functionally a life sentence (like 200 year sentence) should instead be culled. Move the dregs to make way for the people who can be helped. And the 'innocent person wrongly convicted' just speaks to the reforms that're required for the judicial system in America. The abolishment of the death penalty because of 'morality' and muh feels is retarded. They showed no sympathy, so why should we? The families of those killed should be the ones to pull the trigger. Hell, we could make it a sport. Drop them in a cordoned off area with no supplies, and let some people pay to hunt them down like the beasts they are. Would make for great pay-per-view. What's wrong with a little blood sport, anyway?
Should've never gotten rid of barbaric capital punishment. Yeah, it's disgusting. But it worked. Most people wouldn't steal if they knew if they got caught they'd lose a hand. Wouldn't murder if they knew they'd be drawn and quartered. The only ones that'd even try are the ones who don't deserve to be alive anyway.
Burn people at the stake. Have them impaled in the spirit of Vlad of Transylvania. Scare people into not doing shit. And those that still do it? At least we're weeding out the evil people.