But from the synopsis section of that wikipedia page, there is an example of biological control going well in australia: https://en.wikipedia.org/wiki/Cactobla

But from the synopsis section of that wikipedia page, there is an example of biological control going well in australia: https://en.wikipedia.org/wiki/Cactoblastis_cactorum https://en.wikipedia.org/wiki/Cactoblastis_cactorum Perhaps it isn't a black and white issue after all