The UK’s prisons are full, their corridors are understaffed and their Victorian buildings are crumbling. The answer, at least at the moment, is to lock up fewer criminals. The justice secretary has announced plans this week to phase out short sentences – anything less than 12 months - because they produce “hardened criminals rather than rehabilitated offenders.”

Prison reformers have long argued that short sentences don’t work anyway, citing a reoffending rate of over 50%. Others believe that the justice system is already too soft. Community sentences, they insist, send out the wrong message to criminals and open the door to further lawbreaking. Who should and who shouldn’t go to prison?

There’s a wider question; are prisons upholding or undermining justice? Reform campaigners say that prisons are failing both society and the prisoners themselves. The best outcome for everyone is the rehabilitation of criminals, and if that isn’t possible inside prison, it should be explored outside. Others see the redemption of criminals as secondary to justice for their victims and protection for their communities.

Depending on how people see it, prisons are either too harsh or too lax. How should the justice system decide whether to wield the carrot or the stick? Can punishment itself be a necessary step towards rehabilitation? Or is prison too often a futile expression of collective vengeance?

Are prisons doing more harm than good?

Producer: Dan Tierney.