I prefer to look at things at a pessimistic point of view. I see the bad and terrible things of something. I then can find a way to better improve that thing. Besides looking at the glass half empty just means I am closer to my second drink
Still if I were to look at everything in a positive light and try and look for the brighter side, I would feel I could not better grasp at the negative part. If I can not fully examine the negative part I can not begin to recreate it or make something better.