That's because most physics and chemistry experiments don't breed and multiply.
Neither do infertile mosquitoes; your point?
My point was all about what happens when the mosquitos are not as infertile as planned. Or when another unforeseen event takes place. Obviously, if all the promises by these scientists are true, we have no problem. Unfortunately, promises made through the media (and advertising) are often not as simple as it seems.
They are talking about something that happens literally in their own backyard.
Really, you think there's no products of modern chemistry in your backyard?
If chemical companies are going to dump something into my backyard, I will scream and shout just as loud, if not much louder. The OP said that people only complain about biology, not physics and chemistry. Obviously, once "chemistry" becomes something huge, (e.g. "fracking in your own backyard"), this little claim stops being true. If chemistry comes to your backyard, people WILL complain (and rightly so, even when the experts say that all is well).
They are right to do a risk assessment.
And there have been risk assessments done, by regulators, taking into account the scientific data. Risk assessments are not something for Joe Bloe and his GED who reads NaturalNews and thinks that "GMO mosquitoes" means that they're going to bite his children and spread a zombie plague.
You seem to claim that people should just trust experts. I claim that experts should attempt to inform the public better, thereby earning their trust...
Changing the balance in an ecosystem can have huge consequences.
Contrary to popular belief, changing the bottom of a food chain rarely has major consequences; it's the changing of the top of a food chain that tends to have the biggest consequences. The higher up the food chain you go, not only do you have more of a profound impact on the landscape (look at how radically, say, deer overpopulation transforms a whole ecosystem), but also the more species tend to be generalists rather than specialists. Generalists means the ability to switch more readily between food sources, meaning changes further down have little impact on them. But if you eliminate a top predator from an area, the consequences further down can be profound.
So, rabbits that got released in Australia are the top predator? The Pampas grass in California is the top predator? I can make a long list of invasive species that are not the top predator and still influenced their ecosystem a lot. Grass, as far as I know, is pretty much the bottom of the food chain.