Ah, it was in LA (Lower Alabama). OK, now I am not suprised, just about anything can happen in LA once you leave the main road. Given that there are entire counties off the main road that is saying something. We get small wild and feral pigs around here and I live in suburb of the largest metropolitan area in the state.
I would make comments about hunting and other personal bits of info the story gives about the boy and his family but I am afraid they would get into political territory. I will say this: An animal this size, if it were to get off the game preserve, would likely kill several, proabally children, in a small Alabama community before sufficent force was arrayed against it. Nor is there any reasonable way to keep it confined save a large enclosed preserve, which would be expensive and physically difficult to maintain. It could have been moved, I suppose, but that too would have put lives at risk. In the end its just a pig -and likely a hybrid of wild and tame at that.
Also, wild porcine isn't terribly safe. Better to grind it up into sausage and cook it to death than make a lovely roast and kill all of your guests.