I don't have a problem with people owning guns except maybe some AR rifles (WTF are they used for?) But I don't get why anyone would have a problem with background checks.
Apparently, it's the most popular rifle for hunting, but I have also seen arguments against using it for Deer and other larger game because of the caliber. I don't hunt, so I don't know for sure but the one thing I have heard from those who have fired them is that it's a lot of fun at a good outdoor range.
Then, there are the paranoid pinheads like the husband of a cousin, whom I have posted about. He really seems to think their area will be ground zero for some kind of siege but IMO, he would be one of the first to soil himself if it hits the fan. He doesn't even stay in a crowded grocery store because he just can't handle a crowd- it might be part of he "They're all around us! Run! Run for the hills!!!!!!" issue.
WRT background checks- the US has a large number of people who don't want the government to know ANYTHING about them- have you heard someone say "I like to stay under the radar"? The ones I have heard tended to be:
- Dirtbags
- Have had minor police contact but nothing that would prevent them buying a gun
- Country bumpkins
- Wannabes- a soldier, a cop, a whatever.
The ones I know who own these are very responsible- they're cops and military, former members of each, practice regularly and store their weapons very securely.
OTOH, I saw a cop (who also collected & sold guns) head sweep someone with a .45 when we were at work- one of us asked what he was carrying and when he pulled it out, we scattered. Trained, but it doesn't always stick.
MKE just had an incident where the PD went to a motel with an arrest warrant and three of them were shot by the guy, who was also shot. He's a multiple-felony dirtball and he had guns- they refuse to stop being idiots & criminals.
I can only think of a few ways to find & confiscate illegal guns but it will require that the event be full national scale, military-style sweep of cities, going block to block and locking everything down, so nobody comes or goes. Law enforcement will need to have every iota of the warrants & searches conform to the law and it will take decades to slog through the lawsuits. Criminals and guns are very similar to a tub filled with ball bearings- remove some and others fill the space.