Brown admitted this week that the state's open-carry laws only amplified the chaos ignited by the attack. He added that his force is "trying as best we can," but that it's "increasingly challenging when people have AR-15s slung over [their shoulders], and shootings occur in a crowd."
Between 20 and 30 people showed up to the Dallas march with guns, some of them outfitted in camouflage, flak vests and gas masks, according to police. When pandemonium erupted, they became a part of the crowd fleeing in every direction.
U.S. President Barack Obama elucidated the challenge: "Imagine if you're a police officer and you're trying to sort out who is shooting at you and there are a bunch of people who have got guns on them," he said.
Brown also put it bluntly.
"So we don't know who the good guy is versus who the bad guy is if everybody starts shooting," he told reporters this week, right after saying there has "been the presumption that a good guy with a gun is the best way to resolve some of these things."