It is a crime to knowingly give an insane person a gun or any other kind of weapon. No one can be 100% certain that any given person is not sane.
You have already gone seeking a solution in government, to a problem you now say doesn't exist.
I don't seek government solutions because government solves nothing. Insane people getting guns is not a problem requiring a remedy. We don't need Instacheck to esure that insane people don't get guns, or don't buy sharp kitchen utensils at Walmart, or power tools at Home Depot.
This is a government program going in search of a problem.
This law is an attempt to make the NICS actually accomplish the goal you desire.
If there's been a rash of insane people acquiring guns then the problem is insane people walking freely about, not the accessibility of guns.
There are so many reasons to oppose this government program. The federal government has no business doing this to begin with. It's a waste of taxpayers' money. It will undoutedly be used for purposes other than the one it's intended for. It will invariably become more expensive and intrusive.
What we need is the repeal of gun-control and the abolition of the War on Drugs, not another government program or government database.