Zechariah, you've repeatedly made the claim that those who are not willing to believe are pessimistic and are afraid of being disappointed, but do you realize that you need to have some kind of expectation so as to have even the possibility of a negative contrast? There can be no pessimism or fear of disappointment if someone has no expectation and no assumptions to start with. Your argument makes sense from the standpoint of someone who is "unbelieving" in the sense of being very incredulous, but that's just belief turned upside down. They simply believe that something is false rather than true, it's still a belief. Frankly it's just in the same category to me, two sides of the same coin. There is such a thing as non-belief, not having a position at all. That is truly the absence of belief, not just holding another position. It's also what we call being open minded. So I think in general, there can be truth to this idea that someone might choose to believe something is false or does not exist simply out of fear of being disappointed, but the real issue here is the need for a sense of security. Believing in something allows you that sense of security, but if you're honest in acknowledging the unknown then you're without that security. Is it better to fake certainty or to be honest with yourself about what you can reasonably accept as true?