[1Old Pro]

The parents would have known he had mental problems since he had been hospitalized the prior year for making threats.

They knew.

[Erik Latranyi]

The parents and FBI knew this kid was mentally troubled.

The FBI used him and kept grooming him online. They may have even supplied weapons and helped him write the manifesto.

But the FBI will control all the evidence so you will see none of this.

They have indoctrinated mentally ill kids before.