Obama shared a podium with the New Black Panther Party in '07 despite their public call then to "kill cops." (Many Americans still do not know this but, nine years later, that alone isn't the point.)
Because the candidate-elected-president was never challenged about his failure to condemn this call for violence, racist Marxist Muslim 'black power' elements in our society recognized they had free rein. They also saw how Obama's ties to them and their endorsements of him were never questioned.
The networks, in effect, allowed the unchecked Obama to continue to get away with a message he sent way back when: tacit approval of premeditated attacks on law enforcement professionals.
This has translated into our police officers having a bigger target on their backs, with more of them, on this president's watch, ambushed or dead. It is no coincidence that "the glue" holding our society together is under daily attack.