Jobs, Cook, other CEOs -- we fall into fundamental attribution error [1] when we give them too much credit for the success of a company, something Americans are particularly susceptible to (which I say as an American). Not infrequently the best thing they can do is to get out of the way. By contrast, a bad CEO can do much to sink a company.
[1] http://en.wikipedia.org/wiki/Fundamental_attribution_error
EDIT: clarify meaning.