Although I agree with this mostly, the bit in bold reminds me of women who marry men on death row. They know he's supposed to have done bad things, but he's innocent/redeemed/misunderstood etc. Like Richard, they are completely inaccessable, and so are not going to come along and destroy any illusion built up around them.
Good point ..I imagine that is part of the fantasy. If he came back from the dead and said, forget it sisters, I did all of those awful things - who knows if maybe some of them would fall "out of love" with him.. I mean, confirmation of the crooked back did seem to throw Philippa.