Systemic failure, not one scapegoat
Many argue the dispatcher's override was the last hole in a Swiss-cheese stack of bad incentives, normalized deviance and buggy systems, so blame belongs to management and system design.
Alarm fatigue breeds ignored warnings
Frequent false positives teach people, from office workers to rail staff, to ignore alarms; suggestions include fixing sensors, fining repeat false alarms, and not letting warnings be overridable.
GPS fix versus existing signalling
Some insist GPS or sensor fusion could trivially prevent collisions, while rail-savvy commenters counter that interlocking and balises already solve positioning and the failure was a faulty movement authority.