HS
Because pilots, even naval pilots, are human and humans have always made and will always make errors.
Doctors kill more people than Saddam Hussein every year by making mistakes. It's part of the job.
Every now and then helicopters blow toilets over.
Why don't you jump on a different outrage bus?
p.s. It is funny. Anything to do with poo, toilets and disaster is funny to anybody british.