Do you ever hear people saying to “Think Positive!” as if by thinking it, you will make it so? That’s brainwashing.
Your positive thoughts won’t make anything turn out any differently than it would have anyway. In fact, as you are “positive” everything will be just fine, you are no longer preparing for what to do, if they aren’t.
The only reason people harp on that “think positive” crap is because they don’t want to be bothered with you or your troubles.
Positive thinking is just a way of keeping you from annoying others with reality.