The elephant in the room, so to speak, is the stigma of mental illness. The mother was a person who seemed to care very much about what others thought of her and her family. Unlike cancer, many people judge mental illness is a disease that is "bad" and that you "choose to get" or shows a weakness on the part of the individual or the parents. As long as she avoided Adam being diagnosed and treated, she could avoid the social stigma.
We see this issue over and over and over again. When you get cancer, people line up to bring your family meals, send you flowers and start a fund raising campaign. When you get diagnosed with a mental illness people gossip about you, make snarky remarks and avoid you.....no flowers, no meals, no fundraisers. Too often, families hit with mental illness DO go it alone because everyone else is too afraid, too PC, too ashamed, too uninformed...too....well, you get the picture.
Yes, the mother was at fault for not seeking treatment for her son, but it took the rest of her "village" to reinforce her delusions because no one else wanted to deal with Adam, either. It was easier for the Dad to walk away, for the neighbors to look the other way, for the school to wash their hands rather than fight mom.....because dealing with mental illness stinks and no one wants to get involved.
IF we want to prevent another incident we must make mental illness just as "real" and important as cancer, diabetes, or any other disease. We must educate, work on prevention, and take action (we don't let blind people drive vehicles; perhaps people with certain types of diagnosed illnesses should not be allowed to possess or use a gun). And it has to start with each and every one of us. Do you know someone with a family member with mental illness? When was the last time you offered them a kind word, reinforced them for trying to help their loved one, or took over a meal or mowed their lawn? Perhaps today is a day you could take action.....who knows what a kind word might do. Perhaps it would prevent the next "Adam Lanza" from acting out.