The best way to keep dangerous criminals off the street is to rehabilitate the criminals… Or better yet, remove the economic environmental conditions that drive people to crime in the first place.
What’s your alternative? Are we just throwing anybody who gets in a bar fight in prison for the rest of their lives?
If your idea of “justice” worked America would already be the safest place on earth. Despite America only making up around 4% of the population we house 20% of the global prison population . If you’re ideology actually made us safe, don’t you think it would have worked by now?