It would temporarily serve that goal, but also expose him to a large network of criminals and give him a reason to hate society even more.

What would this large network of criminals do? Perhaps they should be in isolation if they're that negative an influence.

Other criminals can teach him how to not get caught or recruit him into larger organizations. Prison is like a startup incubator for gangs. When you put a bunch of people with similar interests in one place it's a great networking opportunity.

Oderint dum impotentes

et postea?