Ironically, the thing that set off the little cretin was that his mother was colluding with the Sandy Hook principal and school social worker on a way to have him committed. He found out, killed her, then went to the school to kill the others who were involved. Who knows why he killed the kids but he may have resented the fact that they were normal and loved but he wasn't. She knew he was nuts. She should have locked up her guns. She should have been more stealthy in her attempt to have him committed. But, she was his mother and couldn't believe he would hurt her. His father would have been more careful with the guns.