"Derp derp y wuld heelerz need heeling?"
Probably because they pulled hate from spam healing to keep the dumb lazy DD (who's taking far more damage than the other 7 members of the party because they're facerolling while standing in a damage hazard) alive.
Some people are such bad players that they're worse than an empty slot in the party, and its best to just let them die before they sabotage the fight or waste too many needed resources.
