Anthony Bradley is my source for many insightful essays on modern culture.
He has two posts on Matthew Murray who shot all those people at the churches.
He was homeschooled and raised pentacostal, conservative, republican, evangelical. The problem: marriage of church and state. He saw it. It sickened him. He was depressed and thought he had lost his eternal security.
Lotsa bad theology. Doesn’t explain the rampage, but does shed some light.