Because one of the legitimate functions of rational government is the protection of God given natural rights of citizens both within by the police and without by the military. The sniper was doing his God given natural duty, and his actions against an enemy were successful. His emotional state and motives were irrelevant.It really is that simple.
I guess his hate-filled killer tendencies is why he gave his post-military life helping other heros and why he died doing so??
The facts have no place in liberalism! These leftists are incapable of a rational thought!!!