Computers are logical and deal in absolutes. People are the exact opposite. Gun control is an emotional, sometimes irrational issue, and the solutions (I suspect) lie in societal changes. Gun control doesn't need advanced technology, as far as I can see. But I'd be interested to know what ideas people have.
A classic anti-technology strawman. It is like saying "Computers only use numbers, you can't do graphics or text with them".
At the very lowest level computers are entirely logical, but you can program one to deal with uncertainties and probabilities.
In fact that argument isn't quite relevant, unless you are arguing against the computers making the policy decisions, which I think was never under consideration.
Computers/technology can certainly be a strong tool to assist gun control.
One idea completely off the top of my head would be to data-mine as much info as possible about past shooting/shooters and then use this to help guide granting (or not) of gun licenses. With Bayesian this-and-that, the computer could give a number "estimated 0.000001% chance of serial killing" and refer the application to the appropriate person (e.g. a detailed analysis for people "at risk" (large probability), or a quicker check for "safer" people).
What parallel absurdity?
A number's meaning is entirely arbitrary and dependent on the context: a bit-string that is a pattern for a firearm in program A might be a perfectly valid music file in program B.
Firearm is a piece of metal that had to be precision shaped to throw small pellets of metal at very high speeds.
(I'll agree that 3D printing muddies the waters though.)