There is so much to learn from the Trayvon Martin affair. One 'take-away' is the importance of self-control. If Martin had been taught, or rather had learned, to control himself he would most likely be alive today. But he didn't. He blew his cool when questioned about his trespassing in a gated community on a rainy night. He punched a man in the face and broke his nose, then jumped on him, pinned him down, and told him that he was going to die that night. So, naturally, the man defended himself against the deadly attack with deadly force. What Zimmerman did was both morally and legally permissible. If some strapping youth is pounding your head into the pavement, you are about to suffer "grave bodily harm" if not death. What we have here is clearly a case of self-defense.
Does race enter into this? In one way it does. Blacks as a group have a rather more emotional nature than whites as a group. (If you deny this, you have never lived in a black neighborhood or worked with blacks, as I have.) So, while self-control is important for all, the early inculcation of self-control is even more important for blacks.
Hard looks, hateful looks, suspicious looks -- we all get them from time to time, but they are not justifications for launching a physical assault on the looker. The same goes for harsh words.
If you want to be successful you must learn to control yourself. You must learn to control your thoughts, your words, and your behavior. You must learn to keep a tight rein on your feelings. Unfortunately, liberals in positions of authority have abdicated when it comes to moral education. For example, they refuse to enforce discipline in classrooms. So liberals, as usual, are part of the problem.
But that is to put it too mildly. There is no decency on the Left, no wisdom, and, increasingly, no sanity. For example, the crazy comparison of Trayvon Martin with Emmet Till. But perhaps I should put the point disjunctively: you are either crazy if you make that comparison, or moral scum.