I think this video here confirms that at the very least, "entertainment" animals are not a "necessity". Nor is their use for our shear amusement "kind" or "cruelty free".
It might be time for us to evaluate what our "modern and civilized" culture is inflicting on innocent animals and how it compares to the bloodthrist of the ancient Romans. Have we really progressed? And if not - isn't it time to do so?