What's wrong with you? You're @#$%& and moaning about what's fair but you can't wrap your head around calling the toss wrong? KC didn't get the choice. It was up to them to pick heads or tails and they got it wrong. It was their choice. They had as fair a chance at getting it as possible. Then they got the opportunity to stop a team from driving it 75 yards down their throat.
I don't think you understand what fair actually means. Why do you think it's more fair for a defense to get only 1 play to stop the opposition from scoring? Why is minimizing the defense's role more fair?