I read once that ironically one of the most important ecological niches for mosquitos is that they keep humans out of a bunch of places that allow those habitats to be preserved. It’s their annoyance and medical danger to people that makes them so valuable to the ecosystem.
Shit, as a Floridian, you may have just convinced me we should let them live. We already have too many people moving here.
That, and their larvae clean freshwater we wouldn't ever think about cleaning, so there's that too.