Thanks for the discussion guys.
But where does the concern about Carbon strength come from? Knowledge or "gut feeling"?
Warplanes as well as F1 racing cars are made with Carbon frame. Hard to believe that a Carbon MTB cannot be trusted.
I have abusing my Carbon road bike for 15yr (before it eventually got stolen) and despite trying hard, I never managed to damage the frame. OK, it was road, but still....

Besides, most/many C-frame bike manufacturers give lifetime warranty.