Thats always the problem. Its the stepping stone theory.
You start off with what is presented as a good idea and get people to agree, as it only affects a small amount of people and the majority appear to benefit. You present this as the end point.
Once agreed you move on to the next "stepping stone" a minor increase in regulation/prohibition but it is also presented as affecting the minority and benefiting the majority and once again its presented as the end point.
repeat ad nauseum (invent/misrepresent/lie about "scientific data, use phrases such as "but think about the children, its for your own/everyones benefit, you have to be saved from yourself... remember you will not be allowed to make your own choice thats bad!!!!) until you get to total prohibition.