It looks like the usual 'Litigation Thing'.
At the slightest sign of trouble, the whole fleet gets grounded. The concept of Corporate Manslaughter is a sound one IMHO, but the downside of it can be cancellations or delay.
But the thing about accident prevention is that you never know when you've been successful - because nothing happens. It costs alot of money and by definition you have nothing to show for it. Difficult to convince the bean-counters that it MUST be done.
It's only when your safety regime has a hole in it that it becomes blatantly obvious.
Cheers, John