I seem to recall Sigma3 telling me that they have a 'if you see it pointed at you, then be a sport and take it' rule. It's an experience rather than a competitive game.
It may be worthwhile having it incorporated into the rules that eye protection must be worn at all times, even when sleeping. Or making tents 'safe zones' where mags must be removed and guns cleared before entering. I have played games with both systems and it is no great hardship and maintains safety.
I have to ask, were there people in that camp without eye protection on? The bald guy outside appears to be covering his eyes until told to put them down, and people in the tents appeared to not have their eye protection on in some cases.