Have there been any monsters deemed so dangerous that slaying any and all of them (incl. to the point of extinction) was considered better for the environment than letting them live?
The Jiivas. They are an invasive species not only to whatever environment they enter, but possibly to the entire planet itself. The egg of one them altered the ecological processes of an entire continent. If an Alatreon, a species known to inhabit only the most inhospitable areas possible, thinks your nest deserves to be destroyed, you are as far from a good thing for the environment as you could possibly be.












