What if crashing the species results in millions of people dying? Will you write a letter to all those mothers?
I'm not saying it shouldn't be done, but we need to know exactly what effects it will have first. And "grieving mothers" is not sufficient.
Do you know of any actual ecologist who thinks that those particular species are vital to the functioning of those ecosystems?
Here is one ecologist who thinks the removal of some mosquito species would be quite harmless:
"Yet in many cases, scientists acknowledge that the ecological scar left by a missing mosquito would heal quickly as the niche was filled by other organisms. Life would continue as before — or even better."
Historically, the species that threaten humans (or are tasty to humans), gets virtually wiped out. There's nothing new or scary about the proposition. Species aren't sacred, as every species dies out and has been replaced by others, countless times for all manner of reasons. Maybe it promotes something worse. There will always be other dangers to contend with.
The ecosystem will be fine without the mosquito species that transmit malaria and even if it wasn't it is a price worth paying. This whole argument is stupid anyway as we already know that killing off these mosquito species in the places where rich people live does not cause the ecosystem to crash.