Author has it bass ackwards. The Trayvon Martin fiasco and attempted lynching of Zimmerman taught conservatives nothing about liberals, and especially about racist blacks and their handlers. Liberals and racist blacks on the otherhand learned quite well that if first you don’t succeed, keep trying.
The thing is that the Liberals do think that the my succeeded with Zimmerman.
A LOT of people still believe the big lie that Zimmerman was a racist white fascist who up and executed a black kid just for the color of his skin.
That narrative has fed into what happened in Ferguson. Had Liberals been unsuccessful in their Zimmerman/Martin narrative there would have been restraint, calls for calm and to allow the investigative process to work.
Instead we got over a weeks worth of riots based on a discredited but still accepted narrative that the cop up and executed Brown just for he color of his skin.