So dancing is not a form of free expression, but you can't regulate porn or ban it because it is?
They have regulated it -- you can't have a shop within a certain number of feet from a church or school.
In Rochester, NY, circa 1850, there was an old article about church members who decided to go to a dance. The church actually kicked them out calling it disgusting. I wish I could remember which book it was in. It sure was an eyepopper.
Regardless, good laws should relate to health, safety and welfare. The present law relates to none.