Sanitize And Sterilize

Denim: Sir, why is Colorado so green?
Pocket: Plant life is an infection, Cadet. Left alone, it festers.
Denim: So a healthy ecosystem is really planetary gangrene.
Pocket: Negative. Why do you think Humans build cities?
Denim: Because they want to live together?
Pocket: No, it's because they want to improve upon nature.
Denim: So a city builder is like a gardener.
Pocket: Exactly. A good steward removes, or exterminates, the undesired species--
Denim: Exterminate! Exterminate!
Pocket: --and plants and grooms only the species he wishes to grow.
Denim: Exterminate!! Exterminate!!
Pocket: Naturally, these include shops, apartment buildings, and factories.
Denim: Exterminate!!! Exterminate!!!
Pocket: You know, sometimes I forget how young and impressionable you are.