Let’s talk about extermination broadly, while setting morality aside. That creature is another creatures food source, or one of the few things that keeps another population in check. It may cause a chain reaction. We can guess, but never really know what will happen to our eco system if we just eradicate a species. You also eliminated the species, not the niche. Theres still room for a species to thrive where fleas once did. Not to mention practically speaking it really hard if at all possible(imagine getting all humans across the planet to dedicate resources towards eradicating a creature) and expensive.
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