It may well be the case that the intelligentsia are far ahead of me, but I wanted to take a moment to complain about something I perceive as an oversimplification in popular science.
Why did dinosaurs have feathers and giant skin-sails? Mating.
Why do birds sing and dance? Mating.
Why does a Hippo spin its tail at high speeds while using it to fling poop everywhere? Mating.
Extrapolating from that kind of thinking, Straight Edgers are just self-milking bull teets, which strikes me as an unfair characterization.
Why do folks shave their hair into a Mohawk?
Why do people choose to drive Escalades?
Why does a married man wear too much cologne to the office?
I think mating is often the easy answer to a more socially complex question.