User blog comment:Doc Hamme/The Artsy World of RWBY: Ozpin's Office/@comment-2006510-20140801043510

Somehow I'm not surprised; back in Episode 10/Vol. 1, he admitted to Ruby that he'd made more mistakes than any man/woman/child on the planet.

Whatever is bad enough to warrant that statement, would no doubt horrify most anyone, at the very least imo. And if Ozpin is a changed man (either as a turned guy, indirectly responsible, or just plain affected even), he'd want to never go there again, and to show openness, warmth and understanding to his students in it's place. Plus such issues are known to do rigorious changes to peoples' characters.