we warehouse them because they are a convenient pool of disenfranchised, vulnerable ppl to make money for private prisons and via the electoral system which bases representatives off population numbers and prisoners count toward those numbers. And for propaganda tools.
Most poor people are not criminals and are not in jail. Even if you take this man at his word, by agreeing and not holding people accountable for their actions you are ignoring and undermining the vast majority of poor people who do not commit crimes.
It's the inevitable consequence of changing the entry condition of slavery to a criminal conviction. Criminalized poverty (and Blackness, by extension) has been the enduring legacy of the 13th Amendment.
What do we do to those not of current use to employers (the corporate state)? Right, we discard them. Then we complain about the number of homeless discards, who then get funneled into prisons.