I mean this game is set in and made by people in Japan, gun culture is very different there. "Impressionable youths" wouldn't even have access to a gun.
Also, the visual of teens shooting themselves in the head is very much a thematic point, as Japan's teen suicide rate is very much a systemic issue they were (and are still) grappling with when the story was written.
How would that work? Considering I mean that past studies have always shown that this doesn't work like that for kids learning things from fictional works.
(nevermind that there's no way they'd have a gun except in some really ass backwards countries without any gun laws)