“Common sense” is fueled by cultural change. It’s kinda of like peer pressure, “the cool kids are doing it”. It just makes sense no armed American should have a battle rifle that can hold 30,40,60 rounds! Think of the damage they could do. It’s just common sense .
It’s a flawed argument, but it’s an effective one. When you are unfamiliar with guns, the idea of people having AR-15s seems wildly unnecessary. I’ve had arguments with 2A people say “it’s a better to make the argument the rifle is good for home defense. Don’t talk about the fighting Tyranny thing”. BUT the fundamental part of 2A is just that. For us to be free from potential tyranny, we have to have tools so we’re not helpless pawns.
The culture is pulling away from this. Anti Gun people own all the major institutions. Universities, big tech, corporations, and now most of the government. They don’t want the little guys to have power. They are the over lords. They control the media and education. The only hope for our nation is found with families passing on our American way of life. There’s a war on the Family too.