It didn't invent it but it was extremely successful at transmitting those values to the youth at the time. While I agree that the conditions of the time would have produced some other similar media had South Park not existed I also think that if South Park specifically did not exist or was not as effective then the cultural currents could have leaned another way leading up to now. When South Park started Captain Planet had just finished and the children who grew up these two conflicting influences are in their 30's now. The world wouldn't be completely different but the balance of power between climate activists and fascists would probably be less bad than it is now.