Honestly, it is by no means normal to hear there is a protest and violence and grab an AR-15 and go check it out, not if you're an 18 year old man who has no earthly reason to be there
But there would have been lots of people there who didn't need to be there & plenty would have been armed. I think the whole idea is crazy.
I also think it's crazy to try & tackle someone you perceive to be an active shooter. Call the police, hide but try & take them down? crazy!
I know people think the US is like the OK Corral or something but honestly this is NOT normal.
I'm sorry I don't think the attitude to guns is normal in many states.