There was no save function in the real world. If he was unhappy with the outcome, he could not reload and start over. If he crushed someone to death only to realize afterward that he had targeted the wrong person, that would be an unforgivable mistake. Henry did not want to degenerate into a bastard who slaughtered innocents.
Besides, the system itself was not without flaws. Henry knew very well that it had a massive blind spot.
Black people in African tribes, savages in the Amazon Rainforest, the people living in New York's sewers who had been excluded from the system, and even people like Jack Reacher after leaving the military would be difficult to judge because they had no digital footprints or too few of them.
But were there really no monsters like Vampires among those people?
So, while the Digital Footprint Tracking System looked useful—and truly was useful—it only provided the first step. Without the resolve to "rather kill ten thousand by mistake than let one slip through," there were still many more steps to take.
Especially among the questionable targets he had identified, the East Coast Metropolitan Area alone had nearly a million suspected targets... Honestly, even a Kryptonian wanted to just drop a nuclear bomb on wherever they gathered most densely and be done with it.
Another use for the tracking system was identifying a trustworthy whitelist. That did not mean those people were flawless saints in moral terms, but at least they had no entanglements of interest with those Vampire monsters.
An interesting discovery was that George Stacy and Tony Stark belonged neither to the high-risk blacklist of suspected Vampires nor to the whitelist of people entirely unrelated to Vampires.
They both belonged to the gray list in between. That meant their life patterns overlapped