As I wrote, Blizzard designed an ingenious mechanic for heroics: there is huge pressure on tanks and healers to do great job, while little pressure on damage dealers. While good damage dealers can speed up the fight, killing the boss before healer is OOM, can avoid damage to make his life easier and watch aggro, if they don't do it, the immediate reason of the wipe will be healer OOM or healer unable to keep the party alive. So arthasdklol, while wipe to red, can maintain the self-image of "l33t guy" who just wiped due to that noob healer. The same way he can't raid but blame the tanks and healers for not being in his guild or leaving it. Arthasdklol will keep playing as he feels good about himself while losing (and feels bad about the healer or tank).
...I wonder what it says about me, that I agree with him.