Why? Because it always does in sci-fi movies? We've had some pretty good results from huge, crazy-sounding plans like this in the past. See: introducing cane toads and rabbits to australia, cats, rats, pigs & dogs to new zealand and the brown tree snake to guam
fixed
While the last one was an accident, messing with ecosystems has never turned out well.
While malaria sucks for those who get infected, we should be making better, cheaper and more available medication against it instead of fucking up entire ecosystems.
Edit: +1 for forced sterilization. People shouldn't be able to pump out kids if they can't support them, and no-one should be allowed to have more than 5 kids. Hell, anything more than 3 is pushing it.
Just because we're born with something (in this case, the possibility of reproduction) doesn't automatically make it a human right. Especially not if it has the possibility of causing lots of suffering.
Crazy far-fetched analogy time: imagine humans were born with a sickle claw, much like a velociraptor. This sickle claw could be used for some pretty bad stuff, e.g. taking hostages on planes and generally would be like carrying a massive knife on you at all times. Would having a sickle claw really be a human right, just because you're born with it?
(Yes, this is pretty far fetched but it's getting late so give me a break)