I don't expect him to understand the mechanics of it. As you said, it's an impossible skill set to execute at the CEO level (especially at a business the size of BP) and know how every single process is designed and functions. That's not what I'm suggesting at all.
But, what good is a CEO if all he/she does is manage financial statement metrics? If that's the case, A) why is he/she being paid so much or B) why aren't they the CFO or Treasurer instead. A CEO must have their hands in on all facets of the business, including operations. Maybe not at the detail level, but certainly at a level where he/she can understand, at the very least, the high-level process flows and the risks present.
Just because Tony sits in a corporate office literally thousands of miles away doesn't mean he can't become well versed in the risks of his business. Again, this isn't some risk that is immaterial to the company and shouldn't hit his radar. We are talking about the risk that the hole you put in the earth suddenly and uncontrollably begins gushing thousands of barrels of oil a day for months. If not for the environmental and PR impacts of an event like that happening, you would at least think the CEO would have a good grasp of the issues for purely a P&L impact. No, I have no experience in this industry, but you are going to SHOCK me if events like those aren't thought of as key risks to the business.
I think this is all important because you have to distinguish this from a "**** happens" one-off event that you fix going forward from a "gross negligence" event where people must own up to it and pay the price - and even be made examples of if that's what it takes (i.e. jail time).
Here is the very least of what I what I want to hear from a CEO in a situation like this:
"We at BP understand the risks associated with deep water drilling and the potential impacts on the environment and 3rd parties should we have a breakdown or failure in operations. In order to mitigate that risks, we have invested in the following technologies, equipment, and people necessary to mitigate those risks:
Let me introduce to you, Joe Blow, our Cheif Safey/Compliance Officer for the Gulf Region of BP Americas" Joe is XXX with # years of experience is YYY operations and safety. He is an expert in the field and has assembled a more than qualified team capable at carrying out the tasks I have set him with. He's going to give you the details of A, B, C, D, and E, our key mechanisms used at ensuring we can carry out our mission without jeopardizing the health of the environment, or the lives of the people affected by potential leaks. He is then going to tell you about what we do to ensure these mechanisms don't fail and what went wrong that day."
(Joe gives technical speech about safety and what went wrong)"
The CEO then needs to reiterate, in layman's terms, what went wrong that day (or the days leading up to it) and the situations were uncontrollable beyond the reasonable means available and implemented by them. Basically, he needs to show negligence wasn't present and then get on to plugging and cleaning. If he can't show that BP didn't set the tone for an effective safety environment, then there's hell to pay beyond cleanup.
Again, the CEO isn't responsible for designing the technical piece of the puzzle, but these guys are smart enough to understand what can go wrong and foster an environment where it is a priority to prevent events like this from happening. If they can't at least do that, then there is something very wrong.
People just want some sort of direct and clear answer that doesn't make it sound like nobody has a 17-ing clue at what happens in that business.
I don't want to make it sound like I think this industry is simple and should be easily understood and operated. It's complicated and takes a large amount of very intelligent people to make things work. Hell, many of the jobs are just outright dangerous. But, that's also why the rewards in this industry are so high - not everyone can just get a team together to explore, obtain, and refine oil and do it well. I think people want to (and should) hold the executives in this industry to a higher standard than other industry because of A) the potential rewards in the business and B) the potential massive impacts should they screw up.