Locked away, securely ?

It appears that some more 'dangerous' convicted criminals have decided to walk out of an open prison. This is something that appears to happen with a monotonous regularity. These are not your average low level offenders but serious and dangerous people who should not be approached by the public. Murder being one of the offences here. What the bloody hell is this type of convicted person doing in an open prison ? We'll find them and issue them with a penalty notice, that'll frighten them. Tough on crime.