"sometimes **** happens", although I can relate in practice, yes there are days when you get unlucky and get a bad set of cards.
The problem i have with this comment is that it goes against everything aviation stands for. In aviation we have systems and rule based logic for everything. That logic has been developed by design or experience over decades and decades and it is the foundation of all safety system. Saying that "**** happens" could be interpreted as saying the system is flawed and does not have to be complied with.
What do you think if Airbus Helicopter would say "sometimes **** happens" when a super puma lost its rotor head above Norway.
they would have been right but its not how aviation work, we get the bottom of it and take corrective action. (we make new design, new procedure....)