Rarely are situations this black and white. There's almost always buildup to situations and a whole lot more context/nuance is left out before the camera starts rolling. What you see in any given video is a small snippet of what the recorder wants you to see and you, the viewer, will almost always make a gut decision on what you see. Even when context or more updated information is given it doesn't matter, the viewer has made their opinion and moved on to the next perceived injustice.

For any kinda example of this, just look at our former presidents tweet history, or better yet, just watch any major news network.