I agree that keeping criminals out of the streets is the first reason. But also to make an example, so future crimes are prevented. Then, while we're at it, reh

I agree that keeping criminals out of the streets is the first reason. But also to make an example, so future crimes are prevented. Then, while we're at it, rehabilitation. Punishment is a barbaric way to look at it. Revenge doesn't mix very well with a legal system. (emotions vs objetive POV)