The defense and the Anthonys, both Cindy and George, cannot undo the damage they've done.
Right from the beginning Jose Baez was grandstanding, seeking fame as the attorney for Casey Anthony. Three days after Casey was arrested, Jose Baez did his first interview with Geraldo, with Cindy Anthony at his side, with the interview taking place in the driveway of the Anthony home. Cindy Anthony was offensive and insulted Geraldo to the point that he's never interviewed her again. In that interview, Jose was just along for the ride.
Since that first nationally televised interview, it's been a media circus. Jose never fails to state, "she's innocent" and "everything will be made clear when we get into the courtroom." Yet, the evidence is damning, and he's had many a day in court to make things clear, yet he only delays the proceedings with poorly written motions, and insults the intelligence of the average person by suggesting that someone else murdered Caylee. Not just some nameless person, but he names innocent individuals, who's only involvement is either in knowing Casey or having found Caylee's remains. Jose's tactics are extremely transparent. But the one thing he's made abundantly clear is that he's incompetant to handle a case of this magnitude.
George and Cindy Anthony likewise cannot undo the damage they've done. Their behavior has been obnoxious from the start. They've lied, withheld evidence, tampered with the investigation, and blamed innocent people for Caylee's death. From their first interview with local media to national media interviews they've changed their stories and thrown out irrational excuses for their daughter's behavior. Their lies are obvious.
But additionally, they've displayed violence towards both media and the public, threatening media with a hammer while calling them "leeches", and threatening protesters gathered in front of their house with a hammer and baseball bat. In that situation, they inserted themselves while the wise thing to do would have been to remain inside and call the police to handle the crowd. George had to be restrained from attacking a cameraman at one time. These are the actions of a very unstable family and it's easy to see that Casey's violence may have stemmed from the violence displayed by her parents.
As I said at the beginning of this post, both the defense and the Anthonys cannot undo the damage they've done. If Jose Baez refrained from any media interviews and offered "no comment" from here on out, it doesn't erase all that he's said and done for the past year and a half.
If George and Cindy Anthony refused interviews from here on out, they cannot undo the images the public has of the behavior they've displayed, the statements they've made, the lies they've told, and their arrogance and sense of entitlement. In addition, their greed in making a monetary profit from their granddaughter's death, has left an image that's impossible to erase.