If you haven't already heard about it, read about it here So, do you think this was a criminal act or an act of domestic terrorism? Explain your reasoning. I believe this was an act of domestic terrorism because his intent was to kill and cause destruction. The definition of terrorism is: the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or idealogical in nature. It was calculated, against civilians and definitely political (from reading his manifesto).