I absolutely believe Livelsberger suffered from PTSD. Notes extracted from his phone stated that he "needed to cleanse his mind of the brothers he had lost and relieve himself of the burden of the lives he took". The VA estimates 22 veterans kill themselves everyday. His notes also stated that this was "not a terrorist attack. PTSD is a mental illness.

This is not an excuse for his actions, but the reasons behind it. Others were injured, but the injuries were described as minor.