It's just a slippery slope.
Did pro wrestling cause Benoit to do what he did. Of course not.....BUT, his brain was in such a dystrophic state, his mush of a brain had to have an impact on whatever decision making process that led him to doing what he did. Is it possible that if Benoit's brain wasn't destroyed to the capacity it was...that he still ends up murdering his wife in a fit of rage? Sure.
Think back to that time and the only wrestler who spoke publicly against the talking point (before what happened was confirmed) was Regal because he was aware of the problems between Benoit and Nancy. Meanwhile, there's Chavo talking about how he trusted Benoit so much, he'd let him babysit his kids. Obviously, these are people who knew each other for years, almost like family (in Chavo's case)...but, how could they not be aware of the breakdown Chris was experiencing?
Then again, Chris' shithole mark doctor was STILL prescribing him loads of drugs up to the days of the murders. Guys who had to trust Benoit with their lives in the ring up to the weekend of the murders apparently never knew anything was wrong with him physically. There were times he would go apeshit in the locker room over something small, but I always got the impression that was just Chris Benoit being himself (he could be a nice guy, but almost at the drop of a dime, he could be a major asshole). The whole debate about how to perceive him....was he a decent guy who turned into a monster the final days of his life....or was he just a ticking timebomb and it happened to explode in 2006?
Just an incredibly horrific situation all ways around.