Usually I chalk these stories up to, people being scared of things they don't understand, but in this case there's legitimate cause for concern. The problem with reducing the mosquito population is as OP said. However, bats rely on mosquitos for their diet more so than any other animal. Depending on how much the mosquito population is reduced, the bats' eating habits will be affected. They'll start eating other insects to compensate and that could have serious consequences for Florida's ecosystem.
Consider this: In Nature all species strive to achieve optimal balance. This is also true collectively for the entire habitat these lifeforms live. Clines are the gradual change in certain characteristics exhibited by members of a series of adjacent populations of organisms of the same species. That's how the habitat slowly evolves, but it is always seeking optimal balance. When a species is decimated or eliminated it disrupts the optimal balance of the entire habitat. Like dominoes falling the effects are felt moving up the chain effecting other species.
The same genetically modified mosquitoes was tried in Brazil several years ago. Initially, it got rid many of the mosquitoes, but new mosquitoes from outside the zone brought in new diseases that were previously 'buffered-out' by the original population of mosquitoes. As a result new diseases were introduced that was otherwise rare and non-existent.
These people playing genetic god cannot see outside of their own laboratories. They don't consider that other species like birds transport mosquitoes. The existing population of mosquitoes IS the mosquito control against outside disease carrying mosquitoes. It's idiocy on steroids.
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