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In this case, I think he's saying that because these are politically motivated shareholders, a reasoned answer would be lost on them. Cook could have whipped out a lengthy powerpoint full of charts and figures, or he could have done the chicken dance, or whatever ... he's saying the shareholders are not asking the question in good faith.
edit - Further, saying what you would prefer Cook do if you had asked the question isn't entirely relevant, since presumably you would be asking sincerely. Cook can probably tell those guys are only there to yank his chain and make him look foolish, so unsurprisingly he was somewhat hostile in response.
It can also be used quite stylishly. Most words can.
Another person suggested small teaching colleges. Seeing as Butler is a 4000-ish person college, maybe there's something to this. But I'd like to think that even in big colleges, the student-health-oriented administrative staff would be on their game. I dunno.
An interesting bit from the wiki(1) on passive voice: "For example, despite Orwell's advice to avoid the passive, his Politics and the English Language (1946) employs passive voice for about 20 percent of its constructions."
As with anything, it's important to be aware of what you're doing. But back when I tutored people in writing, hard-and-fast rules like this resulted in awkward, contorted writing by scared students. For example, I once knew a very smart person who avoided predicate adjectives at all costs. I don't really blame him for confusing passive voice and predicate adjective. I even found cases where the Hemingway app confused the two. But it was too bad that he had been so thoroughly brainwashed against the passive. Though I kind of admired how he managed to avoid, for years of his life, what I think is an indispensable construction.
1 -http://en.wikipedia.org/wiki/English_passive_voice#Advice_in...
Also: I haven't read a whole lot of Hemingway, but when I did read him, I always thought he was much more versatile a writer than made out to be.