In order for the government to effectively outlaw bitcoin, they would have to outlaw the exchanging of encrypted numerical data. Nothing short of this, could effect bitcoin, legally.
if I follow your reasoning, in order for the government to effectively outlaw violence, they would have to outlaw the exchange of kinetic energy ?
Violence has always been controlled by societies. People cannot be allowed to go around injuring others irresponsibly. That is a real, REAL crime. It makes no sense to compare this to bitcoins.