The hunter were affraid that the deers would be eated up by the wolves. Then they would have nothing to hunt. So they killed all wolves, thinking there were the less wolves, the more deers would be alive. Their thoughts are very selfish. Killing wolves only for the short interests has already broken up the balance of the nature.
Because the extinction of the wolves in the moutain, there would be more and more deers. But once the amount of deers were over the load capacity of the moutain, it would cause disaster. Because the grass of the moutain were not enough for the deers, then the deers would be died of starvation. In the end, there would be no prey for hunter to hunt either.