Assuming no extraterrestrials are gun shopping, all of us gun owners are human. With that understood, there is an inherent error capability in all of us. It doesn't matter whether we've only fired 10 rounds or ten thousand. Because we are people, we cannot under any credible circumstance claim perfection in any activity.
Should a co worker start the watercooler talk the way some gun owners do, that he'll never have a car accident because he is trained in how to drive his car,well, he'd be the laughingstock of the building. Everyone knows the moment such talk comes out its hubris;he's a man, just like the rest of us, and thus subject to imperfection and fallibility.
Difference is, mistakes in driving a car result in crumpled metal and some boring paperwork. A mistake in handling a firearm can end someone's life. Rather than assume the arrogant attitude that in the next 70 odd years of my life ill never, ever make a mistake in handling my firearms I take the approach that keeping my neighbors, friends, and myself uninjured and alive is worth a layer of safety.
Those of you on the prideful side of the argument should ask yourselves if you can honestly achieve a 100% safety record for 50+ years continuously, 24 hours a day, 7 days a week. Jeff Cooper didn't. Neither have some Special Forces operators who shoot bad guys for a living.