Humans didn't just one day evolve and stop being monkeys, (for use of a better word) Enough evolved with better reasoning that there was a point, that the benefits of that minority of evolved, out weighed the majority of the less evolved within our species for survival. That's where we are today.  
Unfortunately, less reputable but more involved humans learned very quickly how to play the less evolved majority. 
We are dealing with people that are only spoken language away from being poop tossing chimpanzees. 
These are the people that believe the tobacco industry when they said smoking didn't cause cancer, and today they're the ones who believe the oil company when they say, their product has nothing to do with climate change.