When did being positive become a requirement for living
When did there start to be all this pressure to be happy all the time (or at least look it)
When did it become some kind of social birth defect not to be born with an infectious laugh or vivacious personality, to be the...
and good, and all that.
But one thing I have noticed is it doesn't make a person any more open-minded or understanding of other people's problems.
Also it can cause over-confidence in ones schemes and endeavours, but that's another story.