It is not only evolution to blame for prejudice. It is social conditioning against certain groups, concepts or even everything that is not familiar to them. People usually dislike those how are courageous enough to be free as they themselves don't have the nerve to decide for themselves so why somebody else would?

On the other hand, I guess it is not the tattoos that are addictive, but the sense of control of one's body and the open declaration of it that might be addictive.