I have written about this in other threads. The problem here is that you are writing "instructor/dive centre," implying they are in essence a single entity. They are not. The dive centre controls the conditions of employment for the dive instructor, and the two often have conflicting beliefs.Risk management in the 'training system' is all about liability transfer: agency to instructor/dive centre, instructor/dive centre to student/client/instructor, instructor/dive centre to insurance company.
As an instructor who has conducted training dives in low visibility, I have fought with dive shop management to provide (and pay) an adequate number of certified assistants needed for the conditions we normally face, let alone for the days conditions might be worse.
As the dive manager of the last shop I worked for told me (just before I left), instructors are a dime a dozen. Someone is dropping off a resume about every other week, so an instructor who does not like shop policies can be replaced in a heartbeat.
That explanation will be a lot easier than the explanation provided for the dive shop owner who sent the instructor, assistants, and all that equipment out to the site to certify those students. It will be easier than the explanation to the assistants as to why no one is getting paid for the work they did that day.What needs to happen is to develop the competencies and knowledge of the instructors so that they can recognise the situation and call it, and can then explain to the students/clients clearly why the dive has been cancelled.
I once asked in a thread why 90% of the instructors listed as being expelled from PADI in each issue of the Undersea Journal was Asian, and I got a private reply from someone clearly in the know. He explained that the supposed PADI shops throughout Asia frequently have no official relationship with PADI. They are illegally using PADI's name for the shop because they have PADI instructors on their staff and can offer PADI certifications. The dive shop, not PADI, defines the conditions of employment, and they require the instructors to violate agency policies. If the instructors want a job, they have to do it. When something bad happens, the shop says, "Not my fault." The instructor is expelled, and the shop hires a replacement.
That's Asia. Things are not that different in the rest of the world.