trilobiter:

The phrase “Blue Lives Matter” is as ridiculous as it is offensive.

There are no such thing as “Blue Lives”.  Regardless of all the quasi-secret society/fraternity bullshit they promote, police officers are not a people apart from the the public at large.  A career is not an identity in the way that gender or race or even socioeconomic class are.  It doesn’t matter if your dad and your granddad and your great grandma were police officers.  Your life is not blue.  The only thing blue is your choice to become an instrument of legitimated force.

Furthermore, there exists no systematic structure for the persecution of police; there is only the long-simmering public outrage over the various institutional protections they receive from responsibility for their mistakes and their crimes.  Police officers have never been threatened, as a group, in the same way that black people, as a group, routinely are. 

If that outrage makes them feel threatened, then the police and the society which employs them need to fundamentally reevaluate what kind of people they hire to be officers, what their situation is regarding legal liability, and ultimately what the purpose of a police force actually is.