Because we start out life watching Disney everything. After that real life just doesn't compare.
Because this world wasn't created to be cookie cutter perfect. That's why they say "take life as it comes."
Because we are also allowed joys.
Odd. I read the question as "Why is life so full of miniseries?" at first.
We have created a society that values profit over people. The source of many of our miseries are rooted in that society. If we strove to and created a society that valued people over profits we would all be less miserable.
Why are people so inquisitive?