Those rules make perfect sense, since as most people eventually find out the drunks in a bar can stir up a lot of trouble, and so keeping firearms in your car is a much smarter idea.
Last new years eve, there was one particular drunk at the bar where I went to celebrate who was causing a lot of trouble for everyone. I had brought a snack tray that night consisting of salami cheese and crackers, and after he partook of some, rather than show his gratitute, he tried to pick a fight with me.
He was so drunk however that he would not last 5 seconds. I just keep my interval with him, and maintained my eye contact, watching his hands at all times, and let him vent. Finally he floundered off outside to have a smoke. In his flip flops it would have been easy to crush his toes with my motorcycle boots. And since I can quickly draw and snap open my fighting knife, it would have been easy to blind both his eyes. So I was not suffering from any inferiority next to him, and it would have been like shooting a fawn, so I left him alone and let him talk.
Add guns to that scenario and you could easily end up with a gunfight in a bar with lots of bystanders getting shot as well.
Case in point.