Definition of sniper
I would disagree strongly with your definition of a sniper as a coward. While the "beltway shooter" is probably a coward, I would define a true sniper as a military combatant trained to take out military/tactical targets and come back to fight another day. I know many snipers from my military service a few years ago, and none were cowards. Just because we don't march into battle in rank and file and "wait til we see the whites of their eyes" doesn't mean were cowards.
Back to the beltway shooter, hope he suffers long and hard before going where he belongs for eternity.
The Only Easy Day was Yesterday