This is like saying that Enron is clear evidence that all business is crooked. Unless you have actual evidence that MMA competitions are being faked, there's no reason to engage in rampant speculation just because you happen to dislike the sport.
There are plenty of sports that I find bore me unto tears (Golf, I'm looking at you), but I would still be plenty happy to have famous golfers stand up in favor of skeptical thinking.
So, too, with MMA (a sport I'm not a fan of, either.) Frankly, I find it refreshing to find out that an athlete in a sport generally stereotyped as being populated by idiots is, in fact, an advocate for rational thought.