The people that use that argument don't connect the innocence of daddy-daughter relationships to the evil of romantic or sexual adult-child relationships.

AFAIK, that argument that pedo's will leave their lovers crying in the ditch as soon as they pass the pedo's AoA reached it's peak in the Jackson trials and publicity. I don't think any of those people ever even thought of the similarity you point out.

'Those people' are under the illusion that daddy-daughter physical affection is NOT romantic, and especially NOT sexual. I think it is and, from this post, I'm under the impression you also think it is.

*kill Westermarck* [I hope I don't get bitch slapped for advocating murder].