son a text: the morning of the shooting, crumbley's teacher found a disturbing drawing on his desk. >> in another section of the note was a drawing of a bullet, with the following words above that bullet, "blood everywhere" further down are the words, "my life is useless." and to the right of that are the words, "the world is dead." >> reporter: crumbley's parents were called to the school but refused to take him home, and he went back to class. shortly after, when they heard about the rampage, his mother frantically texted the teen, "ethan, don't do it." >> full level of responsibility do you expect from parents in a situation like this? >> i expect parents and everyone to have humanity and to step in and stop a potential tragedy. >> reporter: cbs news legal analyst rikki klieman called is a bold move to charge crumbley's parents. >> the prosecutor intends to send a message. if you are someone who purchases a handgun for a minor, and you