Cutler's Links
When Cutler met Paper, he assumed Paper had contacted him because he shared Cutler's ideals, but it was nothing but the opposite!
For Cutler's dismay, this meant he had earned a clingy robot who seeks to 'save' him from his bad ways.
With all, even if annoying, Cutler can't help to be fascinated by Paper's undying loyalty and trust of humans, which keeps defying all of the expectations Cutler came to form before.
Paper met Cutler by chance, and had a hard time understanding how Cutler can claim to hate humans.
Instead of leaving Cutler to suffer from the consequences, however, Paper decided to find a way to make Cutler a better robot. Not out of duty, but out of compassion, as Paper honestly believes it'd make Cutler (and any other robot) happier.