During wars, soldiers who step up to butcher one another will often wear a mask that will make their enemies appear like a ‘blob’ of light. When your enemy appears to look like a blob of light, it no longer feels like you are killing a human being. Its more like shooting a beam of light.
Other things to consider: soldiers are stripped of their identity. Everyone’s head is shaved. Everyone is dressed in the same clothes, eat the same food and have one goal: destroy the enemy. Now that you are stripped of your identity, you are no longer accountable, as an individual and using tactics, like the mask, makes your killing job easy because of the perceived distance. I don’t think anybody in their sane mind would kill someone.
My point is that dissociating your feelings and thoughts is a lot easier when the physical distance is increased and it allows you to do things that you wouldn’t do otherwise. I find that people who hide their identity online often reveal their ‘other’ sides and its only natural to do so. Its important that we be conscious of that difference in behavior because what you appear like in person, may not at all be how you appear online and a lot of people judge you with your online presence. Its a question of integrity and as we witness ‘privacy’ changing definitions, you are better off lifting that perceived curtain of privacy.