Now the part where his parents reported him missing two hours before the shooting? That very much smacks of him having told them his intent and then trying to have the cops pick him up while covering their own asses. That says accomplice to me.

Eh, I disagree. Highly like he sent a text message or said something like "Love you guys, I hope one day you understand what I'm about to do."

Not sure what I would do in that kind of situation?

Who knows. We lack the information to know for sure.

Didn't I read somewhere that both of his parents were social workers?