Does that mean we have to wait until those natural regulators get triggered? Let's drop the legends and focus on real effects of careless human behavior.
If you fish or hunt too much it will destroy the species in that certain region and you'll have no more next year, but what if the damage becomes permanent? We have to do what we can to prevent it from happening which means we need regulation.

I live near a forest and see what people can do. They throw away garbage, leave broken bottles, come at night to cut trees because they have a fireplace but don't want to buy wood, about once a year somebody brings an unwanted dog here. One time some idiot brought his dog and tied it to a tree...