We need to reduce overcrowding in prisons by keeping non-dangerous people out and doing something more imaginative (preferably painfully and grossly inconvenient but constructive) with them. Fraudsters, shoplifters and guys who steal jewels or cars, for example. We've had this business of "only serving half their sentences" before. Judges set sentences with that fully in mind. The mindset should be that no-one convicted of a violent or terrorist-related offence is entitled to be released at all unless an extremely thorough review process, backed by a well-funded and professional rehabilitation scheme and afterwards by a properly-funded probation service, has determined that the offender is not a danger to the public. I can't think for one second why this man was released in the knowledge that he would need 24-hour surveillance. That's just potty.