We can assume he didn’t have peaceful intentions. It sure looks like he was going to shoot up the place but the fireman with a gun took him by surprise, he couldn’t raise his rifle without being shot first and he knew he was stuck. Hopefully we will learn about his motives. The story will likely disappear because it looks like a shooting was prevented by a concealed carry licensee.
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The young dumbass had already left the store (without shooting anyone) when he was detained by the fireman.
My view is that he knew he would be arrested even though he was apparently legal in every way.
He was illustrating the fact that gun control would be enforced illegally
He was arrested because breaking the law by cops is easier than catching hell for letting him go free