[X] It's less about it being morally wrong, it's about how this approach to communication with somebody close to you will not lead to a good relationship. Tiffany is being as stupidly self-sacrificial as Harry, by being willing to be caught and seen as a manipulator by Dresden, as long as it's for his sake.
[X] It was the right thing to do, Harry wants to see his daughter and he wants her to be safe, he was just getting in his own way
-[x] As far as Molly could see, what had happened was less manipulation, and closer to helping Harry realize the truth. After all, you can tell someone the truth all you want, but they won't really believe or understand it until/unless they realize it for themselves. Even if they have to be guided to make the realization.