I feel sorry for the people on board that plane, and what they had to endure. I myself know what strong turbulence is like and can only imagine how bad severe turbulence is on the integrity of an aeroplane and the passengers on board; it's quite terrifying. There was certainly no escape from the converging thunderstorms, but as the ongoing analysis has pointed out, 12 similar flights have gone through the same system and didn't suffer the fate AF447 did.
I now doubt the possibility of hail and lightning (because of what has been written) since these are tropical storms but the very strong up drafts must have had dire consequences on any aircraft going through them.