end on infractions, too. If he says 90% is way too high, he's probably right.
So long as we don't count occasional porn viewing, I would've guessed a figure in the 25-35% range (with the majority of those being only occasional offenders).
I had some friends who were bad offenders when I attended — but the two guys I have in mind — even they were very secretive about it, & only their close friends knew what was up years after the infractions were committed. And knowing that is why I said 25-35%. It seemed much less than that, otherwise.