Slight tangent: A previous episode of South Park (Super Best Friends) also showed a picture of Muhammad [1], which caused zero problems. A later one (Cartoon Wars) had Muhammad censored by Comedy Central because it was after the furore over the Dutch Muhammad cartoons.

I guess with all these things it’s about context and the political climate.

[1] https://m.media-amazon.com/images/M/MV5BMjJmMTUzOGEtYjEyNS00...