Bob Crow rightly points out the safety implications caused by there being no staff at railway stations making it an ideal place for muggings, assaults, vandalism, etc...
Also the lack of a guard on driver only trains may have similar results never mind the fact that should the train be involved in a serious incident and the driver has to walk back up to a mile behind the train to lay emergency detonator protection, it would leave the train with no responsible member of staff on board which could result in passengers wandering on to the line & being hit by trains on other lines. Without people like Mr Crow these decisions would be made on a purely financial basis with no thought to safety and security.
Should you find yourself in one of these trains or stations in the future and a member of staff saves you from an assault or mugging who might otherwise not have been there owing to purely financial cuts you might have a different view of the situation.