These incidents where a young man turns into a malicious freak, because of mental issues, radicalization or simply as a result of not fitting in with society will continue as long as family members, friends, school officials and/or police ignore the signs; signs which are quite telling.
Hint: facial tattoos are a dead giveaway! Anyone who tattoos his or her face is not playing with a full deck. Facial tattoos tell a whole lot about a person. Then, there are the social media photos, videos, etc. Finally, the acquisition of a firearm, whether legally or illegally. This guy perfectly checked all of these boxes. Yet not one person did anything to stop him.
Video: YouTube