And I ask you this question: is it morally acceptable to allow someone to harm someone else?
People's ability to buy alcohol is a safety risk. Many crimes and fatal accidents involve alcohol. Do we force everyone to stop drinking alcohol?
I can't think of a government policy that has implemented 100% adoption without tyranny. I'm all for as close to 100% as we can get, but I don't want to lose our values of freedom and respect to get there.