If this report is true, that the gunman’s motivation was nothing more than pure hate for Christians, we can lay this at the feet of the secularists, the ACLU and all the Democrat hate mongers.
Certainly the greater environment that the Children have to live in has a major influence. Anyone that denies that is only looking at this problem from a one dimensional view. There is no way to completely block the Christianophobic rhetoric being splashed around the country in the media and in our schools.
From the other point of view, I know a minister's son who fits the profile of a Christianity reject and his experience was a both a combination of legalism and connections to all things secular. He eventually found more acceptance in the secular world. Even his parents have abandoned him. Sad.