In the Colorado Shooting, the Goof-Ball had a mother and Father at home, In Arzonia the Giffords Shooting, the Goof-ball had a mother and Father at home. They were goof-balls and killed people.
Fair enough. I am not saying that all mass killings are the result of fatherless young men.
All the same, I often read about the shooters in these mass killings feeling “rejected”. In the same way a man can kill people out of feelings of rejection by a girlfriend, a peer group or whatever. It stands to reason that lack of a father can lead to at least some of this violent behavior.
I can’t say that there is a direct correlation between the rise of single-parent households and the rise in violent crime committed by young men. But both things are true; violent crime committed by young men is up along with the rise in single-parent households headed by women. I believe these two facts should be examined to see if there is a correlation.