Did the false narrative about police killing blacks lead to the Dallas cop killings?

Two tragic poilice shootings resulting in the deaths of two young black men have set the country on fire. And the politicians, eager to score points with the minority community, may have unconciously enabled the snipers in Dallas who killed 5 police officers and wounded 6 others.

Before any evidence was gathered at all and before any facts involving the police killings were known, several politicians rushed to judgment and declared a racial motive for the tragedies.