Exactly! When he kills from 1000 yards I'll admit he is a marksman, but still a cowardly back-shooting ba$tard. These people are not "the enemy" they are the innocent. He's some punk sniper-wannabe that is angry at the world for some percieved wrong. Just my humble opinion.
The individual does indeed fit the profile of a sniper. The person shoots from concealment, hits its target and evades capture. The weapon used is irrellevant. The 'supposed skill neccessary' is irrelevant. The shooter is accomplishing exactly what they want to do.
I would offer that a more appropriate term, in addition to sniper, for this individual is TERRORIST. The shooter has terrorized a large segment of the USA by random actions that are successful.
Remeber - A terr has ALL of the advantages. The choose the time, they choose the target and they choose the method.