I'm finding the mental health angle less and less convincing. People are capable of doing these things in their right mind. Is the manifesto a part of the "social contagion"? Treating this as solely a product of mental illness minimizes it. Plenty of people experience abuse and trauma at a young age and don't murder dozens.

Don't get me wrong, I don't think it's irrelevant, not at all. But the ideology can't be ignored, it can't be separated from the act as if it's interchangeable.