Sadly, if only this were true. The gun's published accuracy numbers have 80% of rounds landing within a ~40ft diameter circle at 4,000ft engagement distance. When the gun is fired—typically in one-second bursts—the nose of the plane lifts noticeably by several degrees and so the gun is always employed in a strafing run: you aim a bit below the target, pull the trigger, and let the target pipper rise up across the target. To make matters even worse, its targeting system is the Mk-1 Human Eyeball.
Even in the best possible scenario, you're firing the gun in a high-angle strafe (30º of dive) from 1.2–0.8nm, where you're talking about something closer to a 60ft circle of death that traverses 50ft across the ground while narrowing to 40ft in diameter. Not to mention the 20% of bullets that fall outside this area.
All this is to say that if you fire the Warthog's gun at a target across the block from a school, there's going to be a very serious press conference happening back at home the next day.
You'll see a lot of videos online where the gun seems to perform better than this, but it's always at static target practice ranges where the pilot is flying extremely low and has the benefit of doing multiple practice runs. In real combat footage, the plane is much farther out and the spread is correspondingly much wider. This video does a pretty good job: https://www.youtube.com/watch?v=NvIJvPj_pjE