I don't think you listed enough choices above. The judge may have made the appropriate/correct decision because of a lack of evidence instead of letting it go to a jury that may have made the wrong decision. Also, I think sometimes juries are pressured into certain decisions because of fear of how they may be perceived by the public or some juries may just be biased eg. O.J.
I have served on a jury in the state of Texas where the jury listened to both sides. Prior to our adjourning to the jury room to decide the case, we were returned to the jury room for about 30 minutes. When we returned, the judge made the decision of not guilty based on the evidence. The prosecutor had NOT proven his case against the defendant.
As a juror, I agreed with the decision. However, with some juries the person could have been found guilty.
Now, I don't know if Mr. Watson was guilty or not. However, I do feel a lot of people are found guilty or innocent because of stupid jurors.
Hopefully, there will be a Judgement Day when and where all WRONGS are made RIGHT!