Overcrowded, understaffed and in disrepair, Britain’s prisons are in crisis. One of the first acts of the Labour government was to announce that thousands of prisoners would be let out early to make room for the next wave of inmates. The Scottish government has a similar scheme. Press photographs taken at prison gates show chortling convicts cheering the Prime Minister before climbing into luxury cars and heading off to celebrate.

Arguments rage between those who say we send too many offenders to prison (more, as a proportion of the population, than any other country in Europe) and those who say we don’t catch and punish enough criminals, so we need tougher policing and more jails.

Perhaps the prison crisis is a blessing in disguise, because it is stimulating new ideas. Initiatives are already under way that may develop into long-term solutions. Reformers want more sentences of community service, more curfews enforced by electronic tagging, more flexible parole used as a reward for good behaviour. They point out that the nations with most prisoners are also, by and large, the countries with most crime; in Britain, they say, lawbreaking flourishes in the absence of both deterrence and rehabilitation.

Our sentencing tariffs, criminologists insist, are incoherent and morally dubious; we are too hard on some offenders and too soft on others; we should rewrite the guidelines to distinguish more clearly between wicked criminals and hapless inadequates; most offenders need support, guidance and incentives to address their problems, not incarceration.

But that’s not what the voters tend to think, so it’s not what MPs have tended to support. The majority view has always been that prisons should be used to protect the public. What’s more, they should be unpleasant places, to express society’s disapproval of criminality, and sentences should be longer, because there has to be punishment as well as rehabilitation.

Lock ‘em up or let ‘em out?

The panel: Sonia Sodha, Giles Fraser, Inaya Folarin Iman, Matthew Taylor.