> Their risk was abstract, and caused by ignorance.

There was nothing abstract whatsoever about the lack of adequate preparation and responsibility taken: they did not certify, and they used components that were not rated for the depths of their dives, among many other things. This was not ignorance. This was boldly deciding not to care about safety. They ignored very vocal and direct outspoken concerns from all their peers in the industry for years, specific concerns about what they were doing that was not safe, and they ignored that too. Not abstract.