"Who are you scared of and who are you angry at?" If you're angry at someone for using/possessing IV drugs, why lock them up in prison with the violent offende

"Who are you scared of and who are you angry at?" If you're angry at someone for using/possessing IV drugs, why lock them up in prison with the violent offenders, e.g, the people we're scared of? If you inject people with non-violent crime histories into a violent prison, what do you think the outcome is going to be? More people we're scared of.