The only example of an unaired cartoon that should be aired to it's fanbase that I can think of was already released on DVD, and I dunno about banned ones. But I agree that the episodes shouldn't be on TV or at least edited. And my reasoning for that is, I like anything that prevents conflict.
As for the animated show episodes I know that weren't played on television you didn't list, there are some on this page: http://en.wikipedia.org/wiki/List_of_entertainment_affected_by_the_September_11_attacks#Other_changes_prompted_by_the_events_of_9.2F11
But the first thing that came to mind was an episode of The Boondocks that didn't air in the US.