If you are convinced that things are bad, you will notice many unpleasant things and unpleasant people. It you are convinced that things are good, you will notice many pleasant things and pleasant people. Understand that every one of us selectively perceives the world around us. We see far too many things every time we step outside the door to focus on all of them. You can get all the supporting evidence you want, regardless of whether you start today determined to think the worst of the world or determined to the the best.