You have a good point. The WWE may have known something. But I can't say that for sure, and those text messages alone don't lead me to the instant conclusion of "he murdered his family and killed himself".
National media is full on WWE right now. There was an article on CBS Sportsline right now talking about how WWE is culpable in the murders in a circuitous fashion.
Also, in defense of the wrestlers shown, I would conjecture that WWE did NOT release any information to them regarding the situation. At the time the show was probably taped (mid/late afternoon I would guess) there was no news coverage really whatsoever (first news I saw on a wrestling website was around 4 or so).
All I know is that pretty much every person I've talked to on the subject, both in person and online, has mentioned that it looks really bad for WWE having a tribute show for him, especially the pictures of Benoit, his wife, and child.
Hindsight is 20/20 though.
We'll see how it materializes.
And you're 100% right about taking others out with you. Weak.