The question must be asked: did he elect to shoot and kill an unarmed woman who posed no threat to him? Go back to Drudge, ya putz.
Your ability to look back on this incident with the luxury of time and space and video is noted. However, the agent involved had no such luxury. So what you think of the incident NOW means nothing. All that matters is what a reasonable agent in his position would have thought with regard to intent, motive, and opportunity. The law agrees with the agent, not you.