Obviously, the ICE agents have to rationalise what they do. "We are the good guy, we work against the bad guys". But I don't think that they wake up in the morning hoping that they will have an opportunity to hurt what they themselves consider "average americans".
Looking at the video, I could totally imagine that the first shot fired was a mistake, and then one or more of the agents panic and shoot... well... a LOT of times. That doesn't seem rational, or professional. I don't think that the agent thinks "ahah! Here is my opportunity, I'll shoot him 5 more times". Still, they killed someone for no apparent reason (it's not a proportional defense, quite obviously) and they should be judged for that.
