She has a point—a strange point, but a valid point nonetheless. How many of these shootings have been tied to female rejection? Elliot Rodger and the Isla Vista shooting (which contrary to HuffPo's claims was in a wealthy community). The Toronto car killer. There are quite a few others. Perhaps the rapid proliferation of porn on the Internet has instilled unrealistic expectations and the notion that impulses toward the opposite sex can be gratified instantly. Then when they don't, it leads to rage and bitterness. It could be a factor.
Of course, the left and its "disarmament at all costs" crusade will never admit it, and it does come off as something a 60-something grandma would say, but she might be partially right.
Also note:
The primary in Tennessee is not until August 2. Black faces one realistic challenger, Randy Boyd. I don't know much about him, but the last independent polling not commissioned by Black showed the race very close. Before we panic about a lost seat, HuffPo may have dropped a bombshell a little too early to be effective.