The law doesn't do an especially good job of it either. Perhaps it would be better were we all more observant of the principle than we tend to be; the accused is not always guilty.
I doubt that in Garner case there was any doubt over any verifiable facts. The only things questionable were the feelings of the policemen involved (not following too close the case, though, might be wrong).
So it was never a case of what they did, but was it a crime.
I think that Cosby's fall from grace is better recent example if I read your point correctly
By the logic I was responding to, it is inappropriate to be angry at the cop. He's innocent until proven guilty. That's obviously not how public opinion works.
