The latest school massacres

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You actually can use policy to impact culture.

Let's imagine a scenario where one of the states requires to pass some actual training before getting a gun license. Early on there would be a big hoopla about gun control and whether it's constitutional.

But if it stands, then over a few months you are going to have a new rising group of gun owners with an exclusive club mentality - they feel like they earned it, where gun owners in other states did not. This can be a potent viral strain to infect american gun culture with - remember how the american republicans defended the patriot act and phone tapping and so on? If you don't have anything to hide, you have nothing to worry about. Much the same can happen here internally - within the NRA culture - if you don't want the tests it's because you don't think you can pass.