It was much easier to just let her off than to intellectually analyze everything.
I think you are right. This case took an entire month to present. How could you deliberate even the most pertinent evidence in only a few hours?
Someone on this jury--even if it was only one person--should have stood up for the process and insisted on reviewing the evidence in this trial that implicated Casey as profoundly as it did, even if 11 other people there had no desire to do so for whatever reason.
I have a gut sense that because of the diversity of what was presented, the evidence overshot the critical thinking skills of most everyone there--and those were the people that confused their lack of intelligence with "reasonable doubt". If there was a lone wolf or two that had the ability to parse the evidence in the way that it deserved, they were probably beaten down by the majority.
Personally, I think that a great number of people here would have girded their loins and hung the jury to have this case retried if that is what the situation demanded--but that would require a strong will, an unyielding sense of duty, and a range of leadership skills that I believe no one on this jury possessed.
I'm disappointed in the whole lot of them.