The AR-15 Guys

Saturday at Franklin's BLM march, there were a handful of dudes with AR15's who were "guarding the monuments". They followed the crowd as they marched down Liberty Street in another show of "guarding" or something.
Beyond showing off their big guns and looking intimidating, what was their plan if some perceived trouble broke out? Why would you parade machine guns unless you actually thought there was some danger, right? Were they really prepared to kill people? How do you control an automatic weapon so it just hits the intended target? What if they had to shoot toward the very monuments they were supposedly guarding? What if they started shooting "looters" in front of storefronts? Those stores were open with people inside. Did they actually have any plan besides looking intimidating?
What does this say about their respect and confidence in our Police Department? They didn't think our police could protect the safety of people and property? It seems to me they posed another risk for and to the police. At the end of the day, the AR-15 guys just looked foolish.
Afterward they likely gathered somewhere to crack a brew and pat themselves on the back for saving the city. Maybe they shared stories about some exciting confrontation. They may be emboldened to plan some other event in which they can parade around again and show off their big guns.
Guns and emotions don't mix well. Their presence creates tension. Their intensions are questionable and they are unlikely to have training to handle the situations they may create or believe they need to address.
Certainly someone reading this will say "they have a right"... To me, they pose a danger. I question the mental and emotional stability of civilians needing to parade around in a crowd with an AR-15. They either suffer from great anxiety and fear OR they have some sense of bravado and hero desire. They are carrying a dangerous weapon in a situation they are not equipped to handle.
Arguing that someone has a right to openly carry a weapon makes as much sense to me as saying someone has the right to openly carry around a bomb. We're going to see more of these AR-15 guys around the county and it's not going to end well.