These discussions are endless and almost useless. For example, she did keep guns locked up except 1 by her bed for protection. A discussion between them escalates into argument or a threat to mom’s life. She goes to bedroom to get the weapon to defend herself and son gets to her before she can defend. He takes said weapon from her and kills her. That is hypothetical but as likely a scenario as any other. It is a tragedy without clear answers at the moment at least.
But you left out .
The kid then goes to school to seek revenge on his Mom ‘s friends who are involved in the commitment idea .
The principal and guidance counselor .
Then he decided to kill the kids his Mom lavished attention on last year then on the kindergarden who now in the first grade.