I get what everyone is saying in terms of grayness, but I am black and white when I finally reach a decision. I can, and love to, speculate all day. I rarely make an effort to decide on something. But once forced to make a decision, it is final. You are either with me or against me. And I know it is final because I have spent months deliberating all the possible outcomes.
Also, when debating or discoursing, I need to break things down to its lowest common denominator. When someone is spewing a lot of words, I need to ask them "Is it this or is it that?" or "what exactly is your point?". I need to see where they stand in their argument, or I can't respond to it. So, I guess that is another way of being black or white, too.