Q: Why Do Keynote Speakers Keep Suggesting That Improving Security Is Possible? A: Because Keynote Speakers Make Bad Life Decisions and Are Poor Role Models [keynote address at the 27th USENIX Security Symposium.] (51mins)

They're usually people in positions of authority (e.g. direcotr, ceos, etc)--even in technical conferences. There is a very bad misconception that those in authority somehow have competence in a domain and have opinions that are worth following.