Well, there seems to be an assumption that NICS checks cost money (to the FFL dealer), thus making it a big financial burden for the dealer. I don't think they do.
They don't. They're a free phone call to a toll free number. About the closest thing to a cost burden in the NICS call is the labor time lost to making the call. The whole 'cost of doing business' angle is just plain silly.
But I have no objection in principle to nationwide check whose only purpose is to ensure that people who cannot legally purchase or possess firearms do not in fact purchase or possess firearms.
But this is the crux of the matter. YOU CANNOT.
You want
The State to keep
The Bad People from having firearms. Sadly, it has been conclusively proven that
The State cannot. Washington DC, NYC, and elsewhere are living proof that criminals will always find a way to get a firearm or any other dangerous weapon that they need. There is not such thing as 'ensuring' that prohibited persons do not get firearms.
Now, we certainly can make it harder for
The Bad People to get firearms. We can throw up some roadblocks - simple barriers that stop the feeble minded and those without a willingness to really work at gettin' a gun. But let's be serious - that is all we are doing with NICS.
And in the process of trying to extend NICS, we are slowly sinking in the spiral of 'diminishing-returns-for-vastly-increasing-effort'. Every spiral around the drain brings more and more .gov oversight and more and more 'inconveniences' (like those 10K people a year who were by the .gov's admission improperly denied the right to buy a firearm) as a return on the increasing investment.
At what point do we philosophically realize that it's a fool errand to try to have
The State keep us safe? At what point do we say, much as many of us did vis-a-vis certain aspects of 'The Patriot Act', that the loss of privacy and social liberties are not worth the minimal positive impact (the 'safety') implied by the .gov's actions?
Why do we want to cede the responsibility for our safety to the .gov in exchange for .gov approval for even the most basic of human actions (namely, the transfer of durable property), especially in the face of tens of thousands of years of history proving that
The State cannot keep the bargain that we make with it?
It defies logic.