

Not sure if that’s the reason but I heard that gnu was chosen because gnus, the animal, are essentially one herd spread across Africa. A gnu that loses its particular herd, e.g. while crossing a river, can join any other. Supposedly that’s not the same for other herd animals.
They evaluate reality with other priorities. To them it seems like they are doing good.
Almost all cruelties are committed for the greater good. People just disagree on what is good.