Why are we so fixated on celebrities? Why do we seek them out? Why do we beg for their autographs? Why do we shoot selfies outside their rumored places of residence? Why do we monitor their tweets? Why do we hang on their very public word? Why do we try to make ourselves look like them? Why do we memorialize them with icons and wall-hangings of various sorts?
It may have come about thusly…
A long, long time ago, on a savannah far, far away, at least one of our ancient ancestors discovered the power of the suck-up (alliance). Instead of maintaining a wary distance, this ancestor learned to flatter the alpha de jour into including him or her in a sort of symbiotic alliance. In exchange for being assured of social inclusion and physical protection, our enterprising ancestor provided the alpha with worshipful attention, loyal service, and, in the case of female enterprisers, carnal favors.
In more recent times, the possibility of our ingratiating ourselves into a real suck-up with a real alpha for real social inclusion and real physical protection has all but disappeared. Even so, we can pursue a symbolic (or fantasy) alliance with any number of perceived alphas, toward gaining at least the illusion of real social stature and real physical protection. All we need do is simply allow ourselves to become fixated. Obsessed.
The rest will take care of itself.