Now if that was in his thoughts that might change the picture a bit, but those are not his thoughts as such.
Sure an asshole dad might have thoughts like that. Thing is Frank is not an asshole dad and is trying to do the good and moral thing. Which is actually commendable and we hope all would do outside of games, just with how strong it has been painted and how little if any he has moved in his thoughts it is hard to ever see him happily falling to corruption for me.
Edit:
Ayhsel Like I said that is how it feels to me. You and anyone else has the right to feel differently, I do not even mind it going slow, that makes sense with how Frank is I just would like to see a bit more movement and doubt in his thoughts creeping in over time so the girls can get him where they want him to be.