I mean.... that's a terrible analogy, and a perfect example of my point. It's a terrible analogy because he does a physically dangerous job (not to disregard the actual and horrible physical risks faced by teachers, but rugby players are taking huge damage to their bodies every week as an essential part of the job) that is examined and judged in public by thousands of people and the global media, often unfairly, and it's not at all surprising or unreasonable that all that would take its toll on his mental health, and it's a perfect example of my point because he said "yeah, I don't need this, I'm stepping away for a bit" which is the behaviour of a well balanced individual suited to the role.
Let me try it this way. If we accept that Ofsted are terrible people doing wicked awful things, and I have no reason to disbelieve that although I do suspect that it's somewhat overblown and there may be some element of the public sector being unable and/or unwilling to accept the kind of judgement that is routinely meted out in the private sector, why aren't more headteachers looking for the nearest bridge or bottle of pills? Either Ofsted specifically singled her out for worse treatment than others get, or she was less capable of handling the regular pressures of the role than her peers. Either which way, she could at any point have taken the route that Farrell did and said "fuck you, I'll go do something else".
I'm not meaning to come off as heartless here although I realise that it may seem that way, but the fact is that she clearly wasn't suited to the pressures of her role. That's a recruitment, management and support issue.