Things that don't prevent things 100% of the time

Just sayin is all...
  1. Seatbelt's and airbags don't save 100% of lives in an accident.
    Maybe we shouldn't use them!
  2. Condoms don't prevent 100% of unwanted pregnancies and STDs
    Maybe we shouldn't use them!
  3. Vaccines don't prevent 100% of all know illnesses.
    Maybe we shouldn't use them!
  4. Not everyone stops at red lights.
    Maybe we shouldn't use them!
  5. Doctors can't save 100% of their patients.
    Maybe we shouldn't use them!
  6. 100% of Li.st-ers won't relist or like this list.
    Maybe I shouldn't publish it.