I know it's wrong, but if I could kill all the mosquitoes, I would kill all the mosquitoes.
Same.
There are like 3000 species of mosquitoes. Most don't bite if I understand correctly. A lot of the ones that do don't make you itch.
Mosquitoes are important food for other animals so there would be serious downstream effects of killing them all.
Maybe just kill the ones that transmit disease? I could live with an occasional itchy bite if I knew it wouldn't make me sick.