People are selfish . Or a father who thinks that all his teenage son wants is his wallet and the car keys. Whether we like to admit it or not, we all essentially live for ourselves more often than not. Looking out for number one is as natural as breathing. We're bent that way because of inherited sin.
Life is unfair .
Other people seem to get all the breaks. In graduate school, it was hard to see others get large anonymous checks in their mailbox to pay their school bills when my box was noticeably empty. I was working a fulltime job to pay for school and provide for my family. Those rejoicing recipients didn't even work. It didn't seem fair.