Did you watch the trial? Your statements seem to indicate that you did not. Just about everyone believes just the opposite of what you said: The defense was a bunch of bungling idiots. Jose Baez has been described by many as incompetent.That about tells it all. Jurors can't use common sense. She is INNOCENT until PROVEN guilty. The defense was great and the prosecution was weak. She clearly had something to do with the death, but could not been proven.
The prosecution, on the other hand, did the best job they could do to build a case with a minimal amount of physical evidence and by most accounts their performance was outstanding. The case was won/lost by the lack of physical evidence, not by any oustanding defense lawyering.
Regarding your comments on common sense, the judge SPECIFICALLY STATED the jury could use their common sense if they had an abiding conviction of guilt, which clearly they did not.
I think the jury got it wrong. But I also am glad we live in a society where the justice system favors the defense. I hope that if I am ever falsely accused of something, I am treated with a presumption of innocence. So, even though I disagree with the verdict (and I listened to almost every minute of the trial via streaming coverage), I also agree with those who say the justice system worked in this trial.