The Fifty Flaw sais if there is 50% chance of something going bad and 50% chance of something going good the bad thing will always happen to you. "It's almost like there is 100% chance of everything going wrong." The acceptance of this "flaw" as plausible is often based on personal experience. It's a very moderate pessimistic claim nothing extreme.
-50% of men get cancer.
-Guess i'll die. Fifty Flaw.