You are just not getting the point, parent. I'm not saying that you are wrong, I'm saying that the wool was pulled over your eyes. It happened to all parents, not just you. But we are students, some from decades ago, some from the same time period as your child, that are trying to tell you the truth. You can live on denying it, or you can accept it; it's your choice.
Parents, even parents who caught a first hand glimpse of certain staff in question, didn't see their true colors. Those staff were so sneaky, they were masters of playing a different role in front of parents while still making it seem as if that was who they were all the time. But did your child encounter Rudy in a rap? I know you didn't witness those first hand. And that's where the abuse really flowed.
Sure, perhaps Rudy doesn't stand people up in front of all the other students and belittle his endowment anymore. But that doesn't mean he can't sneak that abuse in, in a more subtle but equally damaging form, in raps. And then when kids complain about what they're subjected to in raps? Well, they usually wouldn't anyways, because they knew it was there word against the facilitators. And the facilitators always won that battle, and would make your life hell for months to come for merely trying to go over their heads.
Parent, that's just how it was. I am confident that your first hand experiences with Rudy did not give you a glimpse of how he handled kids. Even if he treated your kid with utter respect (preferential treatment for some students was the norm at these schools), which would definitely explain your praise for him, doesn't mean he was sticking his abuse to some other poor child.