This story is especially concerning in light of the NSA revelations of late. Suppose this kid actually made this admittedly terrible joke over email. Suppose the recipient of the email was another kid in a foreign country; entirely plausible considering League of Legends is popular worldwide. The NSA could technically catch this email with their dragnet based on keyword search algorithms and pay him a visit, throwing him in jail as a suspected terrorist without a fair trial as the state of Texas has done. Think back to all the stuff you've joked about as a kid and tell me this scenario doesn't enrage and terrify you.
The NSA would have to get a federal court to throw you in jail, and there is no federal court in the country that wouldn't dismiss this case on First Amendment grounds.
Texas courts? Sure. You have to remember that a substantial portion of the 1960's and 1970's were spent reigning in the absolutely batshit things state and local courts and governments do. Its always been bad at that level.