Why does Kazushi Sakuraba continue to tarnish his image?

If Sak had retired after the ryan gracie fight, or even after the Silva fight he would be looked upon as an MMA god right now. the greatest legend in the sport by far. the way he fought in those days, the fun he had, and the level of competition he beat was astounding. it was beyond amazing. instead were left with a sad shell of a man.