Let people believe that life is rough because you have no control over it.
Reality is hard work.
It is a real effort to make life a little more bearable for yourself and others, so people would rather relinquish their own lives to forces that they feel are beyond their control. That, and there is a big difference between speculation on how the universe works and fear mongering. I find it detestable to see the amount of published material out there designed to frighten people into buying more books.