@cowanon
The only thing he probably heard at the time was that there was a gunman who was trying to run away. From this perspective, you can see that his actions were quite heroic, running towards a gunman.
Kyle's actions of self-defense were justified, but that doesn't mean that we should demean this man for trying to protect others.
@cowanon
Bad men can do good things and vice versa. The bald guy was an antagonistic assaulter who needed to get shot. The other two(from their perspectives) were just trying to stop what they thought was a mad gunman.