Smith: “I would like to share a revelation that I have had…”

Smith:   “I would like to share a revelation that I have had during my time here.
It came to me when I tried to classify your species.
I realized that you are not actually mammals.
Every mammal on this planet instinctively develops a natural equilibrium with the surrounding environment.  But you humans do not.  You move to an area and you multiply…  and multiply till every natural resource is consumed.

The only way you can survive is to spread to another area.
There is another organism on this planet that follows the same pattern.
Do you know what it is?
A virus.
Human beings are a disease.  A cancer of this planet.  You are the plague and we are the medicine.”