What you're forgetting is that the NRA (and the politicians they own) are currently controlled not by the NRA membership, but by the gun manufacturers--and anything that might result in fewer customers, and fewer sales, would be bad from their point of view.
I absolutely agree that the contemporary NRA leadership is completely controlled by, and answerable to, the gun manufacturers. It's probably this shift that explains how they have become so much more absolutist and unreasonable in comparison with positions they took even as recently as the late 90s...
But I don't think "politicians they own" is really the right way to put it. There may be a few who are truly in their pocket, but for most I think it's a matter more of "politicians they've been able to terrify"....
The NRA can't contribute any more money to a politician's campaign than any other lobbying organization, but what they
can do is use their vast resources independently to bring down politicos who don't toe-the-line...
The NRA leadership doesn't care what the vast majority of Americans want; they don't care what the vast majority of gun owners want, or even what the vast majority of their own membership wants...
(If they did, they'd be supporting universal background checks)
The whole focus for the NRA today is to keep that 5-10% of the adult population that lives in mortal dread that any day now, the government is going to show up at their door to take away their gun, whipped up into a paranoid frenzy so that they will go out and vote in-lock step the way the NRA says to, based just on the issue of gun restrictions...
And they do a
magnificent job of it. And the smaller the overall voter turnout will be, say in a primary, or a special election, the more this clout becomes magnified.
We saw a classic example of how this works when three years ago, the NRA got two state senators in Colorado who voted for legislation they opposed defeated in recall elections...
And you better believe every politician in America saw it too...
With an electorate as deeply divided as it in much of the country, an organization that can reliably control 5-10% of the vote is not going to have it's desires ignored by the average politician...