people suffering from mental health problems sometimes fall into the trap of thinking they can get away with stuff by blaming the MH problem… there’s quite a few rapists/murderers etc who have played the mental health card and ended up stuck in the forensic mental health system for many many years longer than they would’ve if they’d stuck with the normal prison system.
so as a way of telling if the action is a result of the mental illness or not its all down to assessing capacity.
glad i caught the show last night as previously i had only seen the last 15 minutes. the bit where the lady says about the old chap dying next to his wife as the ambulance crew arrived made the room suddenly go VERY dusty.