That is a pretty disturbing piece of work that kid wrote... If I'd seen that I think I'd be dialing 911 ASAP.
Many members here already stated in the past... The reason why so many fucked up attention whores out there are making mass shooting threats and the like is because the fucking media glorifies these monsters by running their names, faces and death tolls every fucking time you turn a TV on. First step they should take is stop giving these motherfuckers the fame that they crave so much.
Secondly, taking away other peoples' rights when one douchebag does shit or makes chilling statements is never acceptable. Instead, they need to make the POS that made these threats realize the grave consequences of their statements by locking their asses up for a very long time. And even after they get released far in the future, they will still be required to live like a registered sex offender. No guns, and almost no career prospects, and subject to frequent visits from law officers to make sure they are abiding by the terms of their release. Want to be a douchebag? Congratulations, here is your stupid prize. If you want to discourage a certain behavior, make it very costly...