Steve Coogan's character, Alan Partridge, is excellent in that he exposes the ignorance, prejudice, stupidity, and vulnerability in all of us. The good work is being carried on in This Time with Alan Partridge.
When an intelligent comedian (such as Steve Coogan) plays the role of a prejudiced person (such as Alan Partridge), the result is strangely therapeutic. It is perhaps the blessing of metacognition.
In order to depict a mindless moron, one needs to make keen observations in the everyday, seeing how people fall into the pitfalls of mediocrity.
No person is hundred percent vile, nor perfectly good. It is only human to be complacent in one's imperfection. A good comedian captures the human nature and makes a truthful portrait of it. That's where comedy approaches in spirit great works of drama, such as those by William Shakespeare.