According to WWE.com:
WWE.com learned from an interview conducted Tuesday by Vancouver’s News1130 that Chris Benoit’s son Daniel possibly suffered from Fragile X Syndrome, a genetically passed-on condition that results in impairments ranging from physical and learning disabilities, to more severe cognitive or intellectual disabilities.
[...]
A co-worker and long-time friend of the Benoits speculates that perhaps the pressures of home and Daniel’s illness had gotten to him, causing him to snap and take the lives of his wife and son before taking his own.
Is it possible that after Chris killed Nancy (for whatever reason), he felt Daniel wouldn’t be able to get the care and attention he required as a special needs child (if that is indeed true) with no mother and a father either in jail or dead? Did he then decide that the only way he could protect and take care of his son was to take him to the next world and go with him? In his warped and twisted state, did he think this was the only way to shield his son from a difficult life of pain and hardship? It doesn’t condone or justify a damn thing, but it’s the best reason I can think of. I’m trying to put together some semblance of logic for his actions, but it’s an impossible task trying to explain this.
This is a bunch of crap. Is this the best reason they can come up with for why Benoit supposedly did what he did? 
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I think the whole thing is a bunch of crap. I hate that the media is warping Benoit’s image with all of this crap. I don’t like that all the good he had done is being destroyed because of all of this.
I hope everything works out for the best. I feel so bad about this.