I done it because some boobs go "I just looked at your questions and they're stupid" instead of answering my question. It doesn't matter if I was being stupid the other day, this question could be serious. Although if someone adds me and then I add them back, I think they can see my questions but they're not the sort to do what I just described or they wouldn't be on my list.
Some people do that to Protect them Self's from being Targeted some people will go through other people's Profiles and Mass Report Every Single one of there Questions and or Answers