"you are quick to deny its correlation on the few 'psychopaths'"
Ted Bundy blamed his mass murders on the influence of pornography, but I think a televangelist had just visited Bundy at the time, in order to gain free publicity -- oops, I mean save Ted Bundy's soul --  so I think that was Ted Bundy's way of playing the televangelist for a fool.
Robert Dear frequently attempts to explain his shooting spree as wanting to save babies, but he doesn't fit the ideal that pro-lifers want to portray, so he is being shut up and called crazy.
Ted Kaczinski blamed increasing technology, if I recall, for his mail-bomb spree, but maybe mail bombers don't count.
So, not counting Robert Dear, who right-to-lifers studiously ignore, I can't think of a single mass shooting connected to abortion.