I'm not saying these videos aren't showing an injustice and a misuse of force, I'm saying that making a fair conclusion is complicated and should be done by a complex process that you can't hope to do yourself. And if you simply aggregate videos of police using force and label them all as brutality, frankly you are abandoning the ideal of justice in the pursuit of it.
Your site should present these videos as acts that warrant investigation, not as a wall of shame for (assumed) guilty/bad cops (even though many of them are guilty/bad).
There is deep, systemic injustice in our society, and there are murders and brutalities taking place all too often, and this does demand action and attention. I applaud action to that effect and I honor that you are motivated by the pursuit of justice. But you need to recognize that it is a challenging task that requires a measure of elevated ethical discipline in order not to backfire or undermine itself. The principle of "innocent until proven guilty" is a core precept of a good justice system, but not one that your approach seems to embrace.