A real sniper is better defined by the targets he selects: high-value enemy personnel or equipment, preferably at a critical time. Taking out a key officer, a satellite dish or other piece of commo gear or crew-served weapon is the mark of a sniper, not the distance from which he engages his carefully-selected targets or the equipment he uses.
A trained sniper with the average grunt's issue weapon is still a sniper; an untrained rookie with the sniper's weapon is still just an amateur, though he may learn. But by picking unarmed ant-people not even trusted by their own government with weapons with which to fight back, the Maryland shooter has shown he's not much of a real sniper. He's shooting drones and pawns.
-archy-/-
This "shooter" is just a murderer.........Assassin nothing more IMO.
Stay Safe , Armed and CYA Archy !!