Not everyone who needs mental health care knows they need it, nor might they be willing to seek it, based on how we treat "mental patients" in our society.

I guess what I'm saying is that, you are right, attacks like this are few and far between, and that's good. I'm not sure what we can do, if anything, to make them fewer and further between. At some point, this all becomes security theater, that is doing something simply for the sake of "doing something", regardless of it's actual efficacy. In fact, "mental illness" is becoming a red herring to deflect discussion away from the harder topic of "gun control".

FWIW, I feel as safe sending my kids to school today as I did a month ago (that is, I don't give it a second thought).