He is evidence of his own personal inability to bring the necessary skill, talent, determination, and judgement to win a fight. Mike Tyson is not evidence that boxing is good. Royce Gracie is not evidence that Brazilian Jujutsu is good. These two men would have brought the same qualities to any physical, competitive activity. And, given the same skills, either of them would probably beat the ever loving hell out of you and me put together.
Nothing can change that.
So, it's pretty lame to run around whining about which martial art will make you into a great fighter. If you have to ask, you probably won't be a great fighter no matter what you pick. Think of the qualities that go into the typical person that crushes another person under his heel like a cockroach. So, let's make sure those are listed. Let's also list some other characteristics of someone that might be able to defeat and injure another human being.