I think that a similar technological innovation was key during the civil rights movement in the US in the 60s. Capturing the cruelty of racists against blacks in America and showing it on television was crucial for turning public opinion in favor of civil rights.
The difference today is there is no context of what led up to it. Only the act itself which can be spun and edited however anyone likes.
Do police go to far, sometimes yes. Is every encounter where violence occurs to far, probably not. I do agree that when it is too far they need to be held accountable.