Amy Davidson for The New Yorker:

Other advice—that he should have deferred to Zimmerman, politely explained who he was, led him to the house where his father’s girlfriend’s son was waiting—assumes that Martin ought to have known that Zimmerman was just a nice man out to protect the neighborhood. Known how? Because we see how it turned out, we might wish that it had gone one of those ways—run, walk, wheedle, smile, just get home alive and grow older. And, for the moment, never mind the fairness of it all. But he is dead, and we should mind.