And yet there is almost no issue about which you could not make the same authoritarian justification. If the primary determinant regarding government control of individual decisions is merely "is there a social cost", why then no intrusion by the state is unjustified. Mandatory breathalizer interlocks on all new cars, operators licenses for bicycles, banning of toys in happy meals (oh wait they are doing that one in CA). At what point do you draw the line.