Given the history of these mass shooters, these have been issues that have been prevalent or at least suspect in young male shooters. And I believe the mainstream is covering it up so as not to offend anyone. I've gone over this in the past, and more and more these shootings are perpetuated by isolated, socially awkward young males. Probably all hopped up on meds.
http://www.washingtonpost.com/news/...-had-neurological-disorders-including-autism/
4chan is filled with a bunch of aspergers shut ins.