If it has existed without biting humans why is removing disease causing bacteria from two out of hundreds of mosquito species equivalent to eliminating mosquitos?

Is the selective pressure that strong that an animal family that generally doesn't bite humans and ouf of the tiny percentage that does there is an even smaller percentage that carries a bacteria that can kill humans is required for the entire families survival?

No insect is killed. The only change is that the mosquito doesn't carry a bacteria. Yet you equate that to the destruction of an entire species.