The inevitable result of censorship is ignoring reality.
Where life has happiness, so does it have tragedy. There is a balance we can't understand from our subjective perspectives regarding this balance.
Layed out simply, as I understand it, is this:
In order to understand happiness, we must also understand its opposite. For if life was the flattening of all emotion into a simple neutral vs happy state of being - there wouldn't be a human experience. Consequence and triumph would be of little meaning. Our poetry, art, and entire culture would be completely banal and dry.
The very colors of life would be reduced to white and grey.
Our history, our tragedies, our comedies, our human nature - Even the aspects we choose to ignore, are all elements of our collective experience. We must celebrate the good, and remember the bad. Learn from our history, and repeat the lessons that worked.
Through culture, we can experience all that our diverse human nature has to offer.
Censor Human Nature at your own peril.
Video:
Disclaimer - Image and quotes are not mine