"they looked for pro-gun children's books and couldn't find any"
They couldn't find any for the same reason you won't find anti-gun kid's books.
There's no market.
You got an uber-vocal minority on one side and an uber-vocal minority on the other.
The majority does not care (much) either way.
The majority of gun owners and non-owners frown on the antics of the minorities on both sides.
Most folks -- no matter how 'pro' they may be -- aren't gonna walk around with a rifle strapped to their backs or a pistol holstered at the hip (unless they have good reason to).
All this horseshit about pro and anti is molehills inflated into mountains.
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