The UK has one of the highest prision populations per head of all developed countries, yet we have a high crime rate. Look at the US as well. Locking more people up is not the long term solution, it is crime preventable programmes that are run in the communities. The Tories massively cut back on knive crime preventive programmes about a decade ago and now it is coming home to roost. It costs nearly 38 grand a year to fund one prisoner whilst in jail.
Wishy-washy liberal rant over.