I've only just watched the video. Why on earth were those morons laughing and cheering? Couldn't they see a man in a seriously poor state, probably close to death? I note it was supposed to be a charity appearance but he should never have been allowed on that stage. I wish him well in rehab but fear it may well be too late.
You're right. There must've been people backstage who saw what a state he was in. They should've called his appearance off. It's like with George Best and Oliver Reed, people seemed to revel in seeing them self-destruct on TV.