"Everyone"?
This is significantly biasing your perspective, and I don’t think you quite realize by how much.
There are many, many gun owners who are incompetent and irresponsible. There is an entire spectrum, and it’s not a purely bimodal distribution with 95% safety-conscious owners and 5% hoodlums.
well ok, I don't know but there are stats on how many adults have guns, and there are stats on misuses of guns. I suppose a clever statistician would be able to get to some potential overview of how many people who own guns have decent discipline?
Not saying that's you but someone on this site. It is difficult to find anything with a query on Google nowadays, but the things I do find - like https://time.com/6183881/gun-ownership-risks-at-home/ implies to me that the amount of the population that maintains your level of discipline is very low.
So many people provide direct evidence that they do not respect the danger or power of firearms, and most gun owners just look the other way.
Why? Well bad apples and stuff, it's hard to believe perfect discipline is maintained when some of those around you have less than perfect discipline.
It seems like a question that one could probably get pretty close to answering (although not perfect).