The urge is to set themselves apart, and at the same time have everyone applaud them.
Such behavior generally has roots in early childhood. Either the kid fails to develop a sense of self-worth & constantly seeks approval from others; at other times it may be an only child who never matures. Provided with undiluted attention from parents (authority) they seek the same everywhere. This is not to say that all single kids are mal-adjusted, I know some very selfless, caring people who are only kids.
There are different kinds of ASB. I can already identify a few types in the people I meet daily: