Peterson Trial photos

The prosecution in the Scott Peterson murder trial presented as evidence today photos of Laci Peterson's decomposed body.  Maybe I'm stupid, but I'm not sure just what value such photos have in this trial.  No doubt these photos will upset the jurors and probably make them want to make somebody pay for this young woman's death.  But nothing in this article or in anything else I've read about this trial indicates that these photos in any way implicate Scott Peterson.  So, aside from inflaming the passion of the members of the jury and wanting them to make somebody pay, which certainly is to the prosecution's benefit, I don't see what has been accomplished by the photo's presentation.  It does nothing to determine the guilt or innocence of the accused.