That is because the government will do anything to support their currency, and one of the ways is by telling people that bitcoin is only for illegal things. People will think that it is right because people believe that their government won't lie to them. But soon, I think people will realize that the news is not real and they will search the truth for that and if they found that bitcoin can be a new way to make money and bitcoin is the solution to the problem, people will moves to bitcoin while they still use fiat money.