How come Justin Bieber has never played a doctor on a popular tv series?

Alan Alda asked: Bieber fans, how can you justify liking this guy when he never played the role of Hawkeye Pierce, or any other tv doctor?Is Michael Jackson Alive ?

Source: http://justinbieberblog.com/how-come-justin-bieber-has-never-played-a-doctor-on-a-popular-tv-series/

Seth Rogen Jesse Eisenberg Justin Timberlake David Fincher Mark Zuckerberg