I once read that Ben Franklin would make decisions by taking a side and thinking of all the reasons why to do it. When he couldn't think of another reason, he'd take the other side and do the same. He'd go back and forth until he decided. This positive approach to making decisions makes a lot of sense to me. A negative is only considered as a positive for the other side. If it can't be a positive argument for either side -- throw it out. The part about considering both sides is probably part of human nature. Being negative, like prejudice, is a learned trait. Its a shame some of us learn so well.