So, what's the percentage of those 10's of millions who commit these horrific acts of violence? Is it possible that the mental illness is the reason for his actions, and not the medication? As to the question of whether Prozac made his mental illness worse, it would not seem so given the information in the article. But, who knows for sure. Different people have different reactions from the same medications others take. I guess I'd want to know whether any recent incidents might have set him off - such as any arguments with friends or family, a loss of some type, a poor grade in a course or on an assignment, someone rejecting him, etc, etc. Too many variables in these cases to know sometimes what the reasons are.
The guy had rejection in life as well as success. His parents put him in special care during high school. He was successful during college but apparently had emotional problems dealing with a girlfriend. IIRC they’d just broken up recently.