It's nothing personal. It's just their job.

Lovable Sulley and his wisecracking sidekick Mike Wazowski are the top scare team at Monsters, Inc., the scream-processing factory in Monstropolis. When a little girl named Boo wanders into their world, it's the monsters who are scared silly, and it's up to Sulley and Mike to keep her out of sight and get her back home.
In Monsters, Inc., consciousness is carried by monsters and creatures — a plane of “monstropolis”. The story fights on E9/E10 of the E0–E14 reality ladder, compressing prejudice, exploitation, power, technology.