In an adversarial legal system, no one represents "externalities".

Parts of Australia have a deer problem, but despite cultivating a reputation for deadly animals, most of it lacks large terrestrial predators, so introducing wolves is an even harder sell than in the US.

It also has prior historical experience with introducing a species to address a previously introduced species, which then becomes a problem itself: foxes for rabbits; cane toads for cane beetles. cue Simpsons