Some people unfortunately are quite dumb and cannot predict their actions effects.
I cannot say if this is about education or just bare lack of mental capacity but it's a fact that not everybody is interested into learning things. I fix my cars, my electronics, my house, I do research about medical discoveries and psychology. I have few friends because the majority think I am crazy. I do not enjoy intoxicating myself speaking about tv sport or some stupid singers. I don't watch TV but I can fix one. We are not common people.