Why is it none of their business? Guns are deadly. They can kill people.
They are an indicator of abuse in the home.
It SHOULD be EVERYONE's business. I expect a car owner to have insurance, to have a license, to drive a certain way, to have a car that can safely drive on the road, etc.
But a gun, that can kill me easier than a car...well, that is none of my business.
That doesn't make sense.
To address something stated in the OP...
There is no database of gun sales.
There is no database that tells the government who owns what guns.
Any such recording and registering is done at the state level and most states do not require gun registration.
The paperwork involved in background checks is only kept for a few weeks before being destroyed.
One last time, there is no national registry of gun ownership.
It is super annoying that anti-gun people are so ignorant about guns. It reminds me of the Utah legislature and how they legislate alcohol when they are completely ignorant on the subject. It results in stupid and mostly meaningless and ineffective laws.
I don’t feel we have enough information to make any kind of judgment here. Did your friend specify what kind of doctor asked him if he owned a gun? Maybe it was his psychiatrist and he has suicidal issues they’re trying to work out? In that case it’s a legit question and the doctor probably just wanted to ensure that if he did have guns in the home they were not overly easy and impulsively accessible. Storing guns in a gun cabinet under lock and key could be just enough deterant to assuage a dark impulse. Thumbs up to the doctor for his good counsel. Doctors have probably saved more than a few lives by following such a sensible and caring line of inquiry.
I don’t feel we have enough information to make any kind of judgment here. Did your friend specify what kind of doctor asked him if he owned a gun? Maybe it was his psychiatrist and he has suicidal issues they’re trying to work out? In that case it’s a legit question and the doctor probably just wanted to ensure that if he did have guns in the home they were not overly easy and impulsively accessible. Storing guns in a gun cabinet under lock and key could be just enough deterant to assuage a dark impulse. Thumbs up to the doctor for his good counsel. Doctors have probably saved more than a few lives by following such a sensible and caring line of inquiry.