When you are prepared to take him in and feed him, to provide the analgesics as he withdraws, to make his bed, to make sure he gets to the doctor's to get his scrip and other prescriptions, to make sure he gets to the pharmacist to get the medicines, to support him so he does not need to expose his angst to the remuda-fish that the public are, and to pay his bills - then you can tell him that he would be wiser not to gig.

A performer is not public property.