Obviously the one most responsible, is the guy who pulled the trigger and shot the cops.
And when people simply report the truth and that upsets somebody, that's not the reporters' fault.
But when people like Al Sharpton, Chris Matthews etc. go around telling long-debunked lies ("Michael Brown had his hands up and was surrendering when he was shot", "Cops killed Eric Garner because they hated blacks") and their lies inflame some whacko to the point where he murders two cops in cold blood, shouldn't those lying race-baiters share some responsibility for the murdered cops?
How long will we tolerate people telling flagrant lies to whip up their hatred and resentment?
About 2 years, and 29 days longer.
Obama will be gone then.