I think you might also need to consider the context though - well before the thought of a “school shooting” was an annual occurrence. If schools had metal detectors it was for knives or worst case, a hand gun. And guns themselves are not universally liked or practiced with. I seriously doubt someone would suggest that playing an fy_ map is grounds for practicing anything except video games. Extending a video game to reproducing a school ground or neighbourhood seems natural - when I wanted to make my first text based game, I tried making it about different rooms of my house, for example. People often want to model the world around them just to see if they can.