I know you are just trying to make your point to someone who was pre-convinced against the defendant, but you've also inadvertently pointed out just how upside-down our system of justice has become.
Not only have we lost the presumption of innocence, we have even passed the point where the defendent must prove his innocence; he must also then beg for mercy from those who still demand (in spite of the proof of innocence) that he be hung.
I recently sat on a jury of which several women conceded there was a great deal of "reasonable doubt", yet they insisted that the benefit of that reasonable doubt should be in favor of the prosecution, contrary to the simply written jury instructions and definitions. Fortunately, they weren't willing to spend additional days in deliberation.