For me, it's not so much who's to blame as why bother blaming at all? Nine times out of ten, its a combination of things that lead to a wipe... Ya know, unless someone's gone afk to pick their nose during heart phase. When I heal and I die before the tank, maybe I threw down heals a little too hard and the tank was having a hard time keeping aggro. When I am dps, maybe my output isn't quite high enough to clear the field before the tank runs out of cooldowns to fall back on. If people stop blaming one another and just try to meet halfway cooperatively, most (if not all) content would be less stressful and more efficiently cleared. We have enough obstacles, why treat your party members like obstacles too?