How could Adam Lanza's mother not have recognized his abnormalities?

Adam Lanza pic should be enough

Adam Lanza did not just snap in the killing of 20 young children in the 2012 Sandy Hook School gun massacre. He planned it for a year while fascinated with past shootings, having "many similar characteristics and behaviors with other active shooters." He was attracted to young children implying pedophilia, he "was obsessed with firearms, death and mass shootings," and his mother, Nancy Lanza, whom he killed, was concerned about a month before the shootings when he became a shut-in, covering his room windows with black plastic. Good God, what does it take?



We should have known about Newtown shooter...

Online friend experienced Lanza's odd habits...

FBI released documents paint picture of disturbing individual...