No one died but I'll bet a lot of people were undoubtedly made to feel unnecessarily uncomfortable.  Did the gentleman  have a "right" to open carry?  Yes.  Was it appropriate for him to do so?  I don't think so.  He could have "secured" himself and his friends or family from attack by terrorists, or crazed individuals with a concealed weapon and probably would have been more effective by having it concealed should that unlikely event happen.

I have friends in Texas who regularly see people walking into Walmart or McDonald's with AR-15 rifles slung over their shoulders.  Why?  Because they can . Like I said before and proudly admit, I just don't get it.