Another rider who let temptation overtake talent was Geoff Worrell who partnered Anthony Gunter at Suzuki in the mid 70s and was, when he was focused, the better of the two in my opinion. He sadly became a chronic alcoholic and died destitute and lonely a few years ago.
As far as Anthony Gobert, I sincerely hope he can eventually overpower the demons that control his life. Walter's right, he needs support not criticism. He is, along with Shawn Giles the most naturally talented racer I ever saw.