Girl was 4 and boy was 5 when they first started shooting BB guns and a year later 22's. No toy cap pistols in the house but squirt guns were allowed, they knew the difference. They learned gun safety the same way and at the same time they learned to put on their seat belts, not blow their nose on their sleeves and tie their own shoes. They don't remember any of the lessons it was just something they grew up with.
Good intentions will always be pleaded for any assumption of power. The Constitution was made to guard the people against the dangers of good intentions. There are men in all ages who mean to govern will, but they mean to govern. They promise to be good masters, but they mean to be masters.