Well, Nigel, suppose a teacher in a large secondary school was having it off with an underage pupil (as in recent telly drama - God, I love Sheridan Smith...). The headteacher would apologise on behalf of the school even though he couldn't have had anything to do with the offence nor even knew it was going on. Of course he'd apologise. But that wouldn't mean that it was in any way his fault, would it? I must say, I do admire your valiant defence of the indefensible.