Many genocide routes were executed by the human successfully.

Papyrus had lost faith in himself trying to stop the human countless time...

He decided to have a little bit of FUN doing a genocide route himself.

Sans didn't want this all to be this way,

Sans stood in front of his brother hoping to change his mind...

Papyrus didn't care at all, forcing him to kill him in self-defense.

Sans distraught, vowed to avenge his brother no matter the lives he killed.

NO MATTER THE LIVES HE KILLED...