Being killed and eaten is the result, not the means.
Here you have determined the result, then attempted to equate that as an advantage within the means, faulty reasoning.
Most zebras have been stalked
before and know that the safety of the herd is thier advantage. The lion seeks his advantage in stalking the weaker members of the herd, the young, old, and sickly.
The zebra only gets one chance, the lion gets a few. However, when you spread the zebra's risk over the herd, the lion has about the same odds as the zebra.