Alan Dershowitz directly answering Mavrick's question on "why would the investigators have planted evidence? Didn't they have a strong case against Simpson without it?"
I think they did have a very strong, winnable case without planting evidence. First of all, they weren't sure that the glove would not be excluded, and if the glove were excluded, then they needed the sock. And they didn't know at the time they tampered with the sock that the glove would be admissible. They also wanted a slam-dunk case. They wanted the strongest possible case.
I think one reason why the prosecution decided to bring the case in Los Angeles County, where they knew they would get a [pre]dominantly black jury, was they thought they were going to win, and they would rather win and convict a prominent black man by black jurors than by white jurors. They did not want a repeat of Simi Valley and Rodney King and white/black, black/white. They wanted a black jury to convict a prominent black man. And they made a terrible blunder by allowing eight black women to serve on the jury.
I think [prosecuting attorney] Marcia Clark believed that gender would trump race with black women, and it turned out that wasn't the case; that many of these women identified much more with their brothers and fathers and uncles, who had seen police harassment. They were black first and women second.