I couldn't agree more, and it is a sad and ugly truth.
In my personal experience, even those times that I did not lie or deny, either people simply did not believe me or they did not want to hear it or worse, they just didn't care.
Perhaps they did not want to believe it themselves, I am not sure.
The article you are talking about, of course he stated that, ask any of the top ranking staff, adminstrators or officers in most correctional facilities and they will tell you "those kind of things do not go on in this facility". It is much easier to walk away and pretend it's not going on than it is to fight the system. Again, my personal opinion only.