Do you know what the robot realised late at night?
He realised that all he ever and has ever wanted to be was feel needed. Needed by someone, anyone.
Nobody has ever needed the robot. Not his friends, no matter how close they seemed to be. Useless, unneeded, uneccessary. Replaceable.
In fact, the robot has always thought that with its rusting interior, it was a burden to everyone, the robot's family in particular.
Was it the robot's fault for not being good enough?
Is it selfish for the robot to want to feel needed?
Will the robot ever be needed?