I don't know, there may be too many problems and sources of unhappiness in the world to take that approach depending on your perspective. I think this is actual

I don't know, there may be too many problems and sources of unhappiness in the world to take that approach depending on your perspective. I think this is actually one of the causes of some really bad biases (just world hypothesis) that people have: they tie their happiness to their projection of reality, and are then compelled to keep their projection of reality to be very positive to stay happy.