>> He can do with it what he wants, just as any business or enterprise has the right to conduct their own business.
Unless you're a publicly traded company, which Facebook is. Then you are beholden to the people who are invested in your company; some of which I would assume are probably conservative and right leaning.
If FB was still a private company, then yeah, your sentiment holds true. All bets are off when you're a publicly traded and funded company. At that point, it's the investors who tell you what the direction of the company is. Don't like it? Then buyout all the shareholders and return your company back to the private realm.