Condoleezza Rice famously stated:

….. It’s true, what you know today, can affect what you know and do tomorrow; But what you know today cannot affect what you did yesterday….

Nor can what you know today be used to justify what you did not do yesterday.
It is a completely illogical, and irrational position, to attach known realities of the NOW into speculation of what you might have done holding the same information THEN.    It just does not make sense.
How does this apply to the Trayvon Martin shooting?
If, and that’s a big IF, you accept the Benjamin Crump narrative (announced March 20th) of DeeDee listening on the phone when Trayvon and George Zimmerman began to fight, and the known reality of the outcome being Trayvon was shot and killed, it is impossible to reconcile why DeeDee never contacted anyone.
The repeated, “and logical”, question of why is it “DeeDee” never called authorities, never contacted the police, never called Tracy Martin (Trayvon’s dad), never called Sybrina Fulton (Trayvon’s Mom), nor did she ever tell anyone about what she specifically knew that happened; is being reconciled around the framing that she and her parents did not want to join the media circus and chose to remain quiet.
There was no media circus on February 27th the day she discovered Trayvon was dead.  There was no actual reason to worry or fear anything, throughout the entire first week (or more) after the shooting.    There was no logical, factual, or reasonable excuse to remain quiet.
Just because today, now, the shooting has generated much controversy, is not a valid explanation for why nothing was done then; On the first days after the shooting occurred.    The current reality, cannot be reasonably contrasted and used as an excuse to justify the inaction of the time.
Yet, that argument or position of justification, is consistently brought up by supporters of the Benjamin Crump narrative to this simple unanswered question.
It is insufferably ridiculous, illogical, and nonsensical.