I hate making something like that mandatory, but another benefit would be to reduce the stigma of guns in general.

It always surprises me how frequently I hear from otherwise pretty open minded people some version of, "I don't own guns and I've never needed a gun. Therefore nobody anywhere needs one or should have one for any reason and I'd fully support completely banning them, and if that violates the constitution, so what, it's what I want."

Further, gun education would reduce the ideas and legislation to restrict guns based on nonsense. There's a lot of fear of "scary guns" based on little more than superficial appearance, and I even see a lot of ideas from people claiming to want compromise, but it usually comes down to one of a few things: some arbitrary delineation between guns they're okay with because they don't look scary, something that would do little more than make criminals out of otherwise law abiding people, or depriving law abiding citizens of constitutionally guaranteed rights without due process.