Making it a crime to knowingly give an insane person a weapon isn't gun-control. It's common sense. It's as much a crime to knowingly give an insane person a gun as it is to give an insane person a nailgun. But, we don't need Instacheck at gun stores any more than we need it at Home Depot. We do not need a system of any kind to check the mental status of consumers. It is simply not a problem that requires intervention.
If there are insane people walking freely about then they need to be taken somewhere where they pose no threat to themselves or others. But, we don't need more gun-control.
The proposal being discussed on this thread is intended to make government bigger, to further intrude government into places where it doesn't need to intrude, and to give politicians another political football to kick around and beat each other over the head with.
We need to repeal gun-control for several reasons. Gun-control interferes with the ability of people to defend themselves. The process of obtaining a gun is so burdensome that some people don't bother buying a gun. Others won't buy a gun because they're afraid of getting on a list. As we've seen recently the BATF routinely forces gun shop owners to hand over sales records.
Criminals don't obey gun-control by nature. Gun-control merely disarms law-abiding citizens to the disadvantage of criminals who don't obey gun-control anyway.
Gun-control makes criminals out of people who aren't criminals. A legislature can turn hundreds of thousands of people instantly into felons simply because they own a certain kind of gun. California banned the SKS rifle several years ago. The people who registered their rifles received notices in the mail that they had until a certain date to relinquish their rifles or face criminal prosecution. Sometimes people are prosecuted for defending themselves because they were carring a gun when they weren't supposed to. I've read stories in the newspaper about people who were fined and had their gun confiscated because they brandished it when their life was threatened.
We don't need any more gun-control. We don't need stricter enforcement of existing gun-control. Gun-control should be repealed and the state needs to stop harrassing people for owning guns.