Good news is no news?

Very few good news these days. The stock market is tumbling, a son brutally killed his mother, and, above all, it's cold everyday... But if you think about it a little deep, good news is no news. Somehow people tend to prefer to read bad news rather than good ones. Is it because we lack ability to appreciate other people's happiness? Or is it because our self-defense instinct against evil incidents overpowers our ability to feel happiness when a good luck goes to other people?
The picture was taken in Vienna, Austria. It was like the moment god was descending from among clouds.