I'm sure Betteridge's Law could be applied much more effectively to American news headlines than anything else. For example, how many times do we see crazy headlines on Fox News like "Is Obama a gay communist terrorist?"
Indeed that is possibly the main driver for question-type headlines. Any crazy, even libelous, statement can be slipped in if it's worded as a question. The media outlets that rely on them are taking advantage of the biases of their readers, who will, at best, gloss over the text that might say "no", and simply fixate on the question as if it were a valid one. This famously led to the Glenn Beck situation of "We're not saying he's guilty, but he won't deny it!". http://gawker.com/5355901/glenn-beck-pr-genius-spreads-the-f...
I think the law is a commentary on a certain kind of headline: a polar question where the implications would be deeply disturbing if the answer were yes.
