It seems to me that the absolute doli incapax rule is wrong, wrong, wrong.

I don't really have any doubt that the two little bastards knew that what they were doing was wrong - but revelled in that as they had previously revelled in being able to flout any rules on the ground of their age. This is based on "similar fact" anecdotes - my late wife was a social worker.

If their wrongdoing did result from inability to tell right from wrong, then their place is in Broadmoor until it can be shown with reasonable certainty that they do know right from wrong and will choose not to do wrong.

If they did know right from wrong then they should be imprisoned for the protection of the public - until it can be shown with reasonable certainty that they will choose not to do wrong.