A bullet is cheap. Even a prison where you don't feed the prisoners is going to cost much more. Not only that, but the longer you keep them in the prison, the more likely the libtards are going to find a reason to let them go.
I wish we could use the same philosophy (bullets are cheaper than prison) with all these gang-infested areas like Detroit or Englewood, IL (or the entire south side for that matter). But that's a topic for a different debate....