The only persistent argument I've heard is fear of exposing children to the sight of people consuming alcohol or people with alcohol in their systems. This fear, however, has no actual claim, no result that could be deemed inappropriate. Are we teaching children they should drink underage? No. That alcohol is a commonly consumed beverage? Yes. That normal people drink alcohol and still act normal? Yes. If the license isn't approved, there would need to be clear evidence of likely harm. A glass of wine with dinner is a very normal site at a restaurant, whether fine dining or family style.