Relationships/ people are kinda dumb?

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Dumb? Hormones do the thinking for them. The brain isn't even attached or involved until late teens -early 20's. It's like a game of musical chairs. They move from one crush to the next. Both girls and guys learn about and develop their personal power in shallow and manipulative ways. It is the world of appearances. It is also the challenge of the chase. Shortly after they catch their prey [girls are particularly adept at this but guys do it too] they have learned the power they have and they like feeling powerful [attractive, best dressed etc.] and they repeat it again. You are an astute observer, it is shallow. But in the adolescent stage it is a rare person who has developed their person-hood. Advertisers know this which is why they market to adolescent males and females, the world of appearances in apparel, makeup, perfume, soft drinks, music, etc. Strip all that away and they are left with nothing and are bored. Not interested in reading a book, only interested in pop culture and obsessed with what their friends are doing on FB etc.