You're probably right but I don't get it! They really want Jodi to get the death penalty. If the letter is so horrible it could actually lead Jodi to the DP. I don't understand why they wouldn't use it to help their cause. Maybe there's a legal reason it couldn't be entered; I know JM wasn't allowed to argue remorse right? Maybe the only way he could have introduced the letter was if he was allowed to talk remorse.
Maybe the Alexanders are just remaining quiet and keep everything trial related private until after sentencing as to not be accused to be influecing the trial.
I'm guessing Sherry, in her infinite wisdom...has prevented it from coming in.