There are no Queensberry Rules in warfare, anymore than there are in a street brawl. To somebody ingrained with a Queensberry Rules mentality, much - if not most - of modern warfare involves widespread use of "cowards" weapons:
- Intercontinental Ballistic Missiles, bombing from high altitudes, and anti-personnel mines being just several examples of such. Singling out the snipers as "cowards" seems to me to be an exercise of somebody who knows very little of what they are talking about. Snipers actually often work from behind enemy lines, where they are as exposed to danger just as much, if not more, than most other combat soldiers.
As for the movie, I would have thought that the time to form an opinion is after having watched it. That is what I will be doing, anyway!
Bill.