Sorry, how is that evil? If questions are known they can't be used anymore, and often confidential information can come up in interviews, so it seems only sensible. I don't remember hearing of it ever being used against someone, so it's really just a precaution against someone finding out and then disclosing something really important. I suppose I could have said that not discussing people's questions is only polite, for all the weight it carries.
*EDIT: added last sentence.