They persecuted Frisk as well since they were an adept (probably the DETERMINATION itself), and they, in turn, gave up completely. Now they are just a living corpse. This had to be a story where Frisk comes out to speak out to you, but unfortunately the Miiverse admins just don't let me write this part in Frisk's viewpoint. Oh, and as for Copen and his father, when you check their stats...