I doubt your man on the street has ever heard of Bitcointalk or the constant scams on this forum. 

I suspect most of the news people had heard was MtGox stealing a fortune and weird back-alley / coffee shop robberies of Bitcoin sellers.  Also the SilkRoad too if I hadn't already mentioned that.


ELI5 version (explain to me like I'm 5):  Fat Frenchmen [who is now skinny] steals everyone monies.   Bitcoin dangerous.  Bitcoin drugs.  BITCOIN BAD BAD!