If your were surprised my Michael Brown et. al. then you just weren't up to date on how the cops treat poor and/or black people. If you were surprised by the stuff Snowden published it was because you didn't know the history of the federal intelligence and law enforcement agencies. If anything the ATF does surprises you then you must have just slept through the 90s. If this surprises you then you probably weren't keeping tabs on civil liberties at the border, there's been a slow trickle of allegations like this over the years. They can't all be false.
It's all just shit. All these organizations just do terrible things with alarming frequencies but it's ok because they only abuse "bad" people and when they abuse innocent people they can either revise the narrative to make those innocent people bad and/or those innocent people are poor and not well connected. It's like the population is so overwhelmed that it can't focus on fixing any one agency.