Good discussion. It is, I was recently told, human nature to focus on the negative. Your brain will naturally migrate to a problem because if it were solved then the negative stimulus would be removed. Unfortunately, some of us park there, dwelling on the problem - not solving it, but not moving on from it. Stuck on the negative.
I am guilty of this. For example, I find my current job to be tedious and boring. Without conscious intervention on my part my mind will dwell on that fact, overlooking that there are parts of my job that are positive; such as the people working there are fantastic, the commute is good, I am well-compensated, etc.
The alcoholic living in my head feasts on negativity. He's always looking for opportunities to convince me that drinking is better than not drinking, and negativity opens the door for him. There's much more strength in positivity.