Thank you for the opportunity to help you with your question!
It is fair to treat mentally ill criminals differently from other criminals because majority of them do not know what is really happening around them. They should be exempted from caning and doing hard manual labor because these actions will not achieve the objective of molding and changing their behavior.The mentally ill should be taken to the hospitals for psychiatric treatment to regain their sanity before they are corrected.
Please let me know if you need any clarification. I'm always happy to answer your questions.