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News reports I've seen are that the shooter had nothing to do with the protest, but took advantage of the presence of a large number of targets.

Those who carried long guns as part of the protest didn't menace anyone. Also, no telling how many LTC holders were present.

Maybe LTC holders don't go to protests. It presents a difficult scenario. You're at the protest, waving your sign, hollering, whatever, and nearby, shots ring out. Do you unholster? What if you see the shooter, and have a shot? Dare you take it? I think not, with all the police presence.