Reminds me of a match 50+ years ago in Ft. Myers, FL. The fellow next to me had his "Highly Tuned" Colt pistol go full auto, putting several holes through the roof of the range as the pistol climbed! Luckily, no one was injured but I suspect that he left trigger modifications to a professional thereafter!
Having fired an actual, and registered, G18 before... Keeping things relatively on target isn’t that hard...
As long as your firearm is set up correctly for it and you know what you are doing. Barrel porting, compensators, muzzle brakes, or other recoil management devices go a long way to keeping things safe and relatively on target.
Not things you would expect from a gang-banger with his “gat” though...
I had a nearly-new and unmodified Dan Wesson 1911 do that due to a defective sear (I think), on about my tenth magazine fired from it ever. I am still not sure how long it took to go from full to empty, but that fraction of a second seemed like a very long time. I probably could have controlled it if I had been expecting full auto, but it took me totally by surprise. Needless to say, I was done for the day. I got that thing off the range and away from anyone who may have noticed a full-auto pistol as quickly as I could.
The manufacturer was very helpful, paying for shipping and returning the repaired pistol surprisingly quickly, at no cost of course. I'm very happy with the customer service from both S&W and Dan Wesson. And, no, I'll never do risky trigger "modifications" myself.
“Luckily, no one was injured but I suspect that he left trigger modifications to a professional thereafter!”
And therein lies the reason all would scatter or hit the deck. However, a smart shooter could still eliminate the threat of such a fool.