Having just read through this thread quickly I may have missed something. But I would ask how do you judge safety?
My thought would be that it is not as simple as judging intelligence, can you do a test? Can you find hard facts?
Is a company safe because it hasn't had an incident? If it continues to not have an incident is it still safe? Perhaps it is spending too much money on the SMS, perhaps it should reduce its spending! Then at that point is it still safe?
Or is it luck, inevitability?
Do you let a toddler cross a busy road on its own? If it makes it across was it safe?