When will we stop pretending like silver bullet solutions exist and that we can tamper with natural systems like this without introducing impactful unintended consequences? We've repeatedly observed that what happens in the lab has little to do with what happens in nature, yet we ignore this lesson routinely and dangerously. Does science have a learning disorder? Could it be, in part, a lack of humility?
We have in fact solved mosquitoes before but I suspect you would like the side effects even less because everyone would. Filling in swamps and wetlands completely, and mass less than selective insecticide sprayings were how it was done before. They did in fact sicken and kill people through side effects via reduced water quality and exposure to toxins but far fewer than malaria even in the short term. Humanity is frankly terrifying when they are angered enough to cause extinctions deliberately instead of through callousness or accident. Genetic engineering /is/ trying the less harmful option.