Being someone who personally took care of a literal 85 year of alzheimers patient, I can say that if Chris Benoit truly did have that mental brain capacity, he would be more than capable of pulling off the stunt he did. Any number of factors could of been involved. He might of completely forgot about his wife and son at the drop of a hat. Wondering who these strangers were in his home, and could of retaliated. He could of imagined them being dog faced demons or messengers of death trying to take his family away or tell him to do these things. The possibilites are ENDLESS of what an alzheimers patient can think. He could of been slipping in and out of sanity at a moments notice, and on that Sunday morning finally came to, if only breifly. Realized what he had done, and took his own life in grief. He may not of even needed any form of logic or rationale going through his mind to do what he did. It could of been on pure insanity based thought processes alone.
Am I saying this happened with Chris Benoit? No, not really. But its entirely possible.