I’ve been wondering about the same thing in Mother Superior/Blue Fairy thread. I’m leaning towards the theory that it is a plot hole. I think Bae did love his dad despite his Dark One form. That is why he took such desperate measures to save Rumple from himself. I think Rumple might have been able to resist the transformation, but the Blue Fairy should at least have had the decency to tell Bae about that possibility instead of straight away sending him to another world . He could have tried true love’s kiss first without telling his dad why he is kissing him.