Originally Posted by Praefectus
Treat it like you would the writing section of the MCAT. Weigh both sides of the argument (and this goes for virtually any "controversial" question they ask you) and explain the reasoning/give examples for the affirmative and negative ideas. The most vital bit of advice that I could give you for that type of question is to detach your personal beliefs from the question and give your decision at the end, not at the beginning. You should only do that after providing concrete points for either side.
This is an excellent approach to any interview question you might encounter if you have no idea where to begin. I'm noting this post for future reference - this is a great starting point for individuals with underdeveloped interview skills.