You're arguing that abuse should be hidden? For many people (including myself), they first found out about terrible happenings in the world via YouTube videos,

You're arguing that abuse should be hidden? For many people (including myself), they first found out about terrible happenings in the world via YouTube videos, and besides this education being important for better understanding the world, it actually motivates them to do something about it. That said, if there is a possibility that the footage has been produced by intentionally harming an animal then it should obviously be taken down - and that's what the linked article is about.