The system worked as it is laid out. Both sides presented their case. The jury heard weeks of testimony from the prosecution and the defense. In the end, the evidence and testimony convinced twelve people Scott Peterson was a murderer. I'm not certain why that scares you. Can you elaborate on that?
If all the evidence was circumstantial, the prosecution had nothing. And they found him guilty on that and that alone. Just for a moment put yourself in his shoes. Isn't he supposed to be innocent until proven guilty? He was tried and convicted before he was arrested. They had a change of venue. Do you think those people didn't read the paper or watch the news? There was no such thing as a fair trial in this case. I'm just saying they didn't have strong enough evidence for a capital crime case.