Is the Lack of Diversity Vanity Fair's Fault?

IN 2010, VANITY Fair magazine's Hollywood issue featured a bevy of white actresses on the cover (see below). And the magazine took hell from pundits across the country who complained that the magazine ignored a wealth of minority talent.

This year, the magazine ran a cover image featuring two African American actors among the 15 stars. People are still complaining (They are asking: "Are there no Hispanic or Asian actors or actresses worth featuring?").

Does a nationally distributed magazine have a responsibility to be diverse? Or should they profile whomever they feel is among the best rising talents?

Is it the magazine's fault if Hollywood is not promoting African-American or other minority actors?