lots of people have asperger's or autism and don't commit a horrific act. >> absolutely. and i think his parents failed to realize and perhaps the doctors failed to realize how much darkness and evil was brewing in him because they were distracted by the autism. >> reporter: as adam grew more withdrawn, his father says his ex-wife nancy lanza wanted everyone to think everything was okay. he didn't know she was communicating with him by e-mails, his windows covered in black plastic. i didn't understand that adam was drifting away, peter told andrew solomon. he continued to write adam birthday cards, but he last saw adam two years before the newtown shootings. he knew there were guns in the house but he wasn't concerned. >> he described teaching adam to drive. he said he was the most cautious person he ever met. it never occurred to his father he would break the rules. >> reporter: peter lanza wishes now he pushed harder to see his son. even if it had caused fights it could not be worse than what did happen. you can't get anymore evil,

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