>>99203103It's Sony.
Aaron wasn't on board to do a season four at the time and wanted to focus on Black Jesus.
Sony knew that Boondocks made money, so they assumed they could make the show just as well without him.
In a lot of ways, it's very similar to what happened with Chappelle's Show, where they said they would could come back to work on their shows, eventually, but the studios wanted to make the money then and there, and the quality of the show greatly suffered for it.