I have decidedly mixed feelings about this. Like any tool, it could be either good or evil depending on who wields it, but the amount of power it provides greatly amplifies both possible outcomes — and in another five or ten years, it will probably be available to anyone who’s willing to spend the money.
Obligatory science-fiction link: in Harry Harrison’s The Stainless Steel Rat’s Revenge, the main character poses as a representative of an intergalactic weapons manufacturer to infiltrate the militant world of Cliaand:
I unlocked the case and flipped back the lid. The armament specialist glared down at the various components in their padded niches. I explained.
“My firm is the originator and sole manufacturer of the memory line of proximity fuses. No other line is as compact as ours, none as versatile.” I used tweezers to take a fuse from a holder. It was no larger than a pinhead. “This is the most minuscule, designed to be used in a weapon as small as a handgun. Firing activates the fuse which will then detonate the charge in the slug when it comes near a target or predetermined size. This other fuse is the most intelligent, designed for use in heavy weapons or missiles.” They all leaned forward eagerly when I held up the wafer of the Mem-IV and pointed out its singular merits.
“All solid-state construction, capable of resisting incredible pressures, thousands of G’s, massive shocks. It can be preset to detonate only when approaching a specific target, or can be programmed externally and electronically at any time up to the moment of firing. It contains discrimination circuits that will prevent explosion in the vicinity of friendly equipment. It is indeed unique.”
There was no talk of his wares guiding the explosive bullet/warhead/whatever, simply adding some intelligence to when, where, and whether it detonates, but I can foresee this real-world example adding such capabilities in the future as well.