Seems like it's a Sign of the Times.
Looks like this kid, like many others these days, had, in his eyes, a rough childhood. Things were missing. Low (if any) self esteem.
Also wonder sometimes.. When younger folks hear adults talk about the freedoms They had, as compared to the Over Regulated life of today... Eroding those Freedoms..They hold those thoughts in. When or If things get unbearable for them in their personal life, along with everything else, their life falls apart. They Snap and do something terrible, as a final act.
Just some thoughts about A Very Sad Day In Omaha.