You're asking me to watch a cinematic work of fiction to support a theory that kid who has attended a HS from 9-12th grade and witnessed a school massacre, isn't actually what he seems, but a youthful actor inserted into that situation years in advance, complicit in the murder of multiple innocents, just so anti-gun legislation could be passed? Bro, that's crackpot. And I'll go on record in saying that anyone who actually believes that crap, is a mental case, whom I think, due to such delusional beliefs, is probably just as likely to commit similar act as what occurred in Florida.
May be a leetle stretch there at the end, but I'm kinda in your camp on this crap.