Why can't liberals simply answer a yes or no question without a long bs answer?

As any one who can think (from any party/ideology or none) knows, demanding a yes or no answer is usually a cheap debating trick designed to circumvent useful communication. If you can't get a yes or no answer you're maybe not asking a valid yes or no question, and/or you have no genuine interest in the other's opinion. When that's the case the more appropriate answer has more than one word, but two will do it :).