https://www.youtube.com/watch?v=zQNmj2gSq6A
Response time for the police is usually on the order of tens of minutes. A friend lives in the country and called about a suspicious person and had a deputy show up 3.5 hours later. Thieves know this and will be in and out pretty quickly. They know where to look - under the mattress. In the refrigerator/freezer. In the nightstand. On the top shelf of the closet.
Is this different from a thief "casing" your house to determine if you've purchased big ticket items? If their access to the information is logged (which I know isn't always going to be valid) and you're notified that a civilian accessed your gun inventory record, is that more or less problematic than someone who just watches your house every weekend for a few weeks after, say, Christmas, to see what large packaging you throw out without breaking down?
I'm reconsidering my opinion on public access, for certain, and I'm sincerely trying to be as informed on the caveats as best I can.
This sort of database would not be opt-out.
Obviously there is a possibility for a database loss if they tracked all gun sales, but considering the stat that 30% of households have a firearm and the many other possible associated data sets the risk seems minimal.
That percentage goes up and down depending on people's willingness to admit that to a nosy surveyer; RKBA activists attribute this recent increase to the huge numbers of first time owners who haven't yet decided on a policy of discretion. Me, I wonder how many of us longer term owners have adopted a FU attitude in the presidential campaign with the starkest choice ever presented to us, excepting perhaps G. H. W. Bush vs. Dukakis, but Bush the father was much closer to total prohibitionist Dukakis, and in fact we're still living with his import bans....
You are of course right that a list of suspected gun owners could be generated in a whole bunch of ways, although I note that when it comes to online ammo dealers I've never seen a group of vendors who are faster in discarding their records of past sales.