> "Your saying we do things that save human lives, irrespective of the outcome?"

In fact, no, they did not say that. They said that the considered balance of the merits strongly favors eradicating the 2% of mosquito species that carry human diseases for someone who gives greater weight to the benefit of saving a billion human lives[0] than to the cost of some trout eating the thousands of other mosquito species instead.

[0] - 700 million contracted mosquito-borne illnesses each year worldwide. Death isn't the only consequence of significance.