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[jimmy the one]

7. often disregarded or not used

Unknown Beatle A simple gun lock would have done it. They come in all sizes.

And gun locks have been around & available for decades, yet still around 20% -30% of gun owners with children leave their guns unlocked & sometimes loaded or with accessible ammo nearby.
Accidental gun deaths tend lower in states with firearm storage laws & c.a.p. laws (child access prevention laws), and tend higher in states with little gun control.
The trigger lock law in Washington DC (&/or firearm disassembly), for a ten-year run at least, there were zero accidental child deaths by firearms (0 - 14yo) (wisqars source).

The trigger locks in your picture appear to be on the high side, cost wise, tho I've never bought one like that; a simple thicker lock resembling a bicycle lock, is available for a lot less I believe. In fact I have two, & they were free, given out by pennsy atty general Katherine Baker Knoll (sp) at an election rally I went to for john Kerry - but alas, had no firearms to use them with, they do double as short bike locks!