They clearly are for both. You want the idea of going to prison to be on someone's mind when they seek out to commit a crime. And once they get there, you need to make sure a) they don't want to come back and b) they won't come back.
When you consider the socio-economic background of most crime (especially physical theft and violent crime) in almost every developed country, you kinda realize that not providing with them the skills to get employed when they get out is outright just daring them get back into the system.
You are right, there are limits. But these limits should not be set up by gut feelings. You gotta study the issue, and make the decision carefully to maximize good. Or else you end up with some hell hole of a system.
When you consider the socio-economic background of most crime (especially physical theft and violent crime) in almost every developed country, you kinda realize that not providing with them the skills to get employed when they get out is outright just daring them get back into the system.
You are right, there are limits. But these limits should not be set up by gut feelings. You gotta study the issue, and make the decision carefully to maximize good. Or else you end up with some hell hole of a system.