Ok,I am bad at explaining......
Alright, here it goes: They came across us and found that we were dying. They placed us on a life support of some kind and began trying to save us. After a while, our vitals started to fail, so they dropped us off to die. If they had waited a little longer, they would have seen that we fought past it as our genes mutated us and made us stronger.
This makes things more clear?