re: "no rules, no regimentation, no regulation."
Yes, but there is also waste, violence, cruelty and death on a vast scale.
Waste? Not much waste in nature. Almost everything gets used by something.
Violence and death? Certainly. Loads of it. The churning between life and death is constant.
"Cruelty" is a human concept, involving options and deliberate choices. Animals are what they are. It's not like a lion has the option to euthanize a gazelle with an injection, or that it could even occur to it.
But the overall ecosystem works, and as a whole is far more stable and resilient than artificial systems like human agriculture.