Remember, we have to think about rehabilitation, otherwise segregation is just another form of punishment. So, it seems that segregation implies: There is some

Remember, we have to think about rehabilitation, otherwise segregation is just another form of punishment. So, it seems that segregation implies: There is something wrong with the individual, therefore we have to keep them from being within harm's reach of the general populace. This is a binary, on-off mechanism. That is why society, I guess, opted for unpleasant segregation, as a means of doling out a variable "fix" to the problem (mild for petty crimes, heavy for serious ones). Otherwise, you'd have to segregate each individual that ever does any sort of wrong, or breaks any violent law, etc.