The same distinction is what allows us to express outrage in the Eric Garner case.

Many demonstrably innocent people are indicted and convicted with far less evidence than a video. Nonetheless, for other cases I grant the point.

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

Not really - the cop that killed Eric Garner wasn't even indicted/accused.

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.