But in reality, "beg the question" is actually a type of logical fallacy, which is "assuming as true the very point that is under discussion," according to Theodore Bernstein.
A perfect example of this fallacy is an article from TheWeek.com entitled "Why do so many liberals despise Christianity?" The author, Damon Linker, argues that liberals hate Christianity (like lack of centralized oversight and accountability), but begins with a statement that already assumes that liberals hate Christianity. By "begging the question," the author is able to attribute the beliefs of some liberals to hate for Christianity without having to show evidence that hatred of Christianity motivates these beliefs.
So when a Slate.com editorial expresses "ambivalence toward missionary medicine," we can ignore writer Brian Palmer's arguments supporting his ambivalence because we know he's really saying what he's saying because he hates Christianity because he is liberal and liberals hate Christianity. Oddly, the article concludes that missionary medicine is a good thing and saves lives, and secular Americans should set aside their reservations and "let God do His work." But obviously, he's being insincere because he hates Christians because he's a liberal and liberals hate religion.