FWIW I asked my mom what she thought about how the school administration handled this. She’s a retired middle school principal in Michigan. She said the school couldn’t suspend him because he hadn’t done anything. She said you have to threaten someone or get into a fight before suspension is an option. I’m sure looking at ammunition on your cell phone and having violent drawings could be considered a threat to some but because he didn’t put hands on anyone or threaten anyone directly, there was only so much they could do.
If you Google ‘kid suspended drawing’ there are several stories on the first page of kids who were suspended just for drawing offensive images. All less graphic than what this killer was described to have drawn.
Even if it were not considered a threat, kids get suspended for far less than threats or fights all the time. I’m sure there was some lesser offense they could have sent him home for. How about a fews days suspension for using his cellphone during class? And you’d think that, in today’s climate, a kid either looking up guns or drawing guns would be automatic grounds for a backpack and locker search. I don’t think the administrators hands were tied at all, they just didn’t take it as seriously as they should have.