couple things...
1. I don't think that guy actually knows what "social Darwinism" is. "Social Darwinism" is an economic concept. When someone dies partially due to inferior intellect (as is frequently implied in the show), that's just normal Darwinism.
2. Why aren't the families of the deceased a little offended to see their dead loved ones portrayed as half-retarded baboons for the sake of what amounts to *beep* and giggles?
"You people voted for Hubert Humphrey! And you killed Jesus!"