There are thousands of species of mosquitoes that don’t suck blood or spread disease. The most prominent 10 cause the vast majority of the destruction, and are much more valid targets then a random bird that Mao gathered peasants militias to kill.
Seems like the issue is invasive species, a problem caused by people, rather than mosquitoes as a whole.
Removing all invasive mosquitoes is just cleaning up our mistakes and a lot less morally worrying than killing all mosquitoes just because they’re harmful to us. Of course getting rid of them because they’re harmful to us is somewhat valid, but getting rid of invasive mosquitoes is a good compromise anyways.
The problem here isn’t invasive mosquitos, it’s just that those invasive species have exacerbated the problem 10 fold as they are better breeders, more aggressive, larger, and more hardy then other mosquitos.
The problem still remains even if all of those magically disappear.
Also I see nothing morally wrong will valuing human life over an insect with limited to practically no impact in its habitants and niche.