"So why D.O.? Why not an MD or naturopath. "
1.^ Because you believe in osteopathic tenets and like them more than the corresponding MD ones / hippocratic oath.
But why? My instinct is that because they are wholesome. First one especially
Osteopathic medicine in the United States - Wikipedia
But is this a common answer? If you didn't describe them as just wholesome, what are some other ways you described the good aspects of the tenets of osteopathic medicine?
2. But then what's wrong the Hippocratic Oath and MD tenet? Or naturopathic tenets? What do you feel is lacking in them?
Did you talk about the negative parts of MD school tenets in your interview?
3. At any point, did you mention that you are unable to get into MD schools? Is it common / advised just not to say this ever? Do they ask?
4. Should you avoid mentioning that you didn't know what D.O. was until you realized there was a good chance of being rejected by MD schools? I admit this is my case.