Lack of familiarity was the culprit for the few accidents there were during that time:

Explaining that he began teaching his own kids how to use guns at the age of four, Barton said that people only want to get rid of guns because they are afraid of them, which can be attributed to the fact that they don’t know how to use them.

As such, if everyone had a gun and was taught how to use it from childhood, there would never be any firearm incidents or accidents, just like during the founding era

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I have searched and in the founding era I think I’ve only ever found two gun accidents and everybody was hauling guns back then; you took your guns to church, you were required by state law in some states to take your guns to church.  We didn’t have accidents because everyone was familiar with how to use them.  It’s not being familiar that makes is dangerous.

Hat tip - Right Wing Watch