Oh I take it seriously and I also agree that in the US there's a large population that's sent to prison for no good reason, with almost no attention paid to rehabilitation and treatment.
However I have doubts that, when people who hold that position come to power, El Chapo will be walking free with no restrictions the next morning.
Some form of restriction of movement will be required for frequent violent offenders. You may abolish the old system since you believe it's rotten to the core and you may call whatever replaces it something other than prison, but it will still be prison.
