Parasite Changes Host Into Desirable Food to Further Its Own Survival

Presumably, the dramatic change in appearance and behavior tricks birds into eating infected ants – parasites and all – so that the bird can spread the parasite in its feces. The fruit-eating birds’ droppings, which are mostly seeds and insect parts, are gathered by other ants who then feed and unwittingly infect their young.

I was wondering; what if we were a parasitic organism placed on this planet to transform it into something else?

What if our destruction/transformation of our environment was engineered by some other unknown system/entity to make us ore the earth something else that was desired by said unknown system/entity ?