Why do we dwell on the negative?

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Let's assume a friend of yours looked at you one afternoon and said "your lower lip is swollen". Out of surprise webbed with shock, you decided to catch a glimpse at the mirror. It's a common knowledge that the 1st thing u will see in the mirror is your lower lip. Albeit, the mirror had no idea as to what you wanted to see, it showed u a reflection of your full self with your legs,eyes,ears,etc, but all you saw was your lip. You failed to notice the new pimples that just sprouted on your face,neither did you notice the patches of eczema that just rented an abode on your face, all you saw was your swollen lip because your attention was directed to your lip. They are umpteen things that constitute a human-weakness,bravery,skills,etc; it's quiet amazing that most people tend to focus only on the bad stories about themselves or others. 'Elvis is a thief', of course that's true! But the same Elvis is humble, a good runner,etc, depending on what you want to see! So why dwell only on the negative?