> I think it's probably a pretty prosocial thing to do, unless I'm missing something

Agreed. I'm in South Texas where we have Aedes mosquitoes that are an invasive species and spread Malaria, Dengue, Zika, and other infections which kill people. I consider disrupting their lifecycle to be an unvarnished good. I carry mosquito dunks in my pocket when I go on walks and toss them into any puddles, drains, storm sewers, and ponds I encounter, and it seems to have helped a lot anecdotally. I care a lot about nature/ecology, but also fuck mosquitoes.