oh man i need to stay away from the psych section...
this may get dangerous for my work in beyond bitcoin....
"negative" thinking is one side of the coin. anytime you omit ANY part of the reality of a situation, you are excluding potentially vital data. The problem comes when people begin obsessing over the worst case scenarios and begin seeing themselves as incapable of adapting and taking control. They feel helpless and valueless--incapable of preparing for or accomodating the dangers of change and "downsides". Because of this they unintentionally cause a self fulfilling prophecy.