And don't you think it's quite sad (and disturbing) to have clients doing the safety auditing instead of the aviation authorities?
That's pretty much SOP these days
HKA
Here in Oz, all of the major mining companies as well as others perform their own Audits on operators, be they local or overseas.
The minimum standards by the Aviation Authorities seem not to be adequate to stave off the litigation these guys face if their staff have been found to be assigned to a "questionable" operator.
The term questionable of course, only becomes obvious AFTER the accident.