I know we would all prefer to have as much of an authentic 1880s experience at Silver Dollar City as possible, but at the end of the day it is still a theme park.
Yes, I am about to use some overly exaggerated, and overly drastic examples, but not everything has too be exactly authentic. Back in the 1880s, it was common place for someone have a gun on their hip. That doesnt mean that Silver Dollar City should now sell six shooters. Back in the 1880s, the main mode of transportation was by horse. That doesnt mean Silver Dollar City should now sell horses. Back in the 1880s, alcohol was sold at the Saloon. That doesnt mean that Silver Dollar City should now sell alcohol.
Like most things in life, moderation is the key. In reality, a little alcohol is fine, so long as that is not the main attraction. Plus, you have to define your criteria for alcohol. There is a big difference between selling knock off beer in a can, and authentic alcoholic recipes of the 1880's.