Having recently served on a jury for a criminal case, I'll add an opinion here...
There wasn't a single person on the jury who doubted the defendant's guilt...
However, after hearing all of the evidence against the defendant, we all knew that the prosecution had not PROVED his guilt.
The judge cited George Washington, if I remember correctly, as saying "It is better to let 99 guilty men go free, than to imprison one innocent man."
Yes, I, and most of the jury, did not walk away from this trial without feeling some doubt as to our verdict. I know I walked away with a migraine. However, I still feel that we have to uphold the right of a defendent to be 'innocent until proven guilty', regardless of the situation.