>firstly, that it does not apply (no single point of failure like a king, in this answer here)

I'm a bit late coming into this discussion. But I think I should like to clarify that Kings were not all powerful autocrats. They had councils and other Kings they had to answer to. Still, some went "rogue" as it were.

So to me the question is, could one of the people who control the levers "go rogue" do they/would they have controls to guard against that?