If open carry is legal why would you be concerned? If you are afraid of people with guns why are you on a gun board?
I agree with the old grump on that point.
However, whatever the legalities of this case, I think it does point out some of the issues associated with open-carry in a society where the majority of people don't carry, and many people associate carrying guns with potential criminal/sociopathic behavior.
Concealed carry simply avoids all the panic and misunderstanding some people experience when "a man with a gun" is around, and gives a tactical advantage to the carrier where a weapon might be needed.
Just because someone can open-carry, doesn't always mean it's a good idea to do so. Just my opinion.