What do you think about "negative thinking?"?

I recently read a few articles on the subject and found the concept very interesting. Although not American, I grew up with American culture and certainly TV and movies, books and newspapers. I never really second-guessed the concept of positive thinking and all those self-help books that use it. I just assumed that you were either the kind of person who benefitted from it, or not. Just as some people are auto-didactic, some prefer (or need) to be taught.

But I never really thought that positive thinking and re-affirmation could be downright WRONG – and some say harmful, to about 50% of the people.

Look up negative thinking and the studies and reasons, then tell us of your thoughts and maybe even experiences, good and bad.

:-)