Diminished responsibility is why he plead guilty to manslaughter.
He may have had voices telling him to kill. It doesn't mean he'd be incapable of driving a van. It's very complex, I don't understand it all well enough myself to explain it properly.
Dimished responsibility caused by mental illness, likely caused by his own self inflicted use of drugs.
Drug use is a personal choice. If you choose to go down this path, then you are responsible for your own actions.
No sympathy, nor any leniency should have been given whatsoever. The guy should have been rightly done for triple murder.
The verdict has been an utter disgrace and highlights what an utter joke the justice system is.
I feel exceptionally sorry for the families that have had to suffer the trauma and this appalling outcome.
I seriously hope they launch an appeal to the responsible Government Minister for a retrial of the odious scumbag - with a suitable sentence to match.