It would be appropriate since he killed his parents and he was the only named heir that now that they are no longer here their money should be used to bring him to justice and to keep him in prison.

If he received legal aid then surely tax payers should be informed of what happened to the other money.

If he is seriously mentally ill then you would expect him to get appropriate treatment. I didn't see the programme and I haven't managed to find any mention of any treatment he is receiving that would mean he could be released back into the community after only five years.