:I'm not sure why it matters what Albers' state of mind was - the objective facts are pretty clear. Any officer of the law who levels a rifle at unarmed, peaceful protestors, says "I will fucking kill you, get back" and responds with "Go fuck yourself" when asked to identify himself is clearly acting inappropriately. If Albers felt they weren't peaceful - then that's Albers' problem with understanding the nature of the word. There are no allegations that Albers was threatened with violence nor are there any allegations that the protestors he aimed a weapon at were armed. Merely feeling discomfort with people who oppose you is not, under any objective consideration of policing, valid reason to threaten them with deadly force. 
 :The secondary reliable sources here are effectively unanimous. I'm not aware of any reliable source making any claims that what Albers did was appropriate - but if there are some, we should certainly include them.