Yeah, it's fine to have stuff you want to hide for a lot of reasons. The problem I have with what the parent posted is that the specifically invoke "FBI" as what they're afraid of. That suggests to me that they aren't just hiding embarrassing or private information, but specifically something illegal. Now, as other posters have mentioned, parent could be an activist or something, but frankly I doubt that everyone I've seen post something similar is. I'm left with the conclusion that in addition to being holier-than-thou assholes and pedants, a lot of tech people are also casually engaged in things like tax evasion and securities fraud.