As mentioned above, you are making an unjustified assumption about the other posters in this thread (myself included, apparently). Every request to give up a preselected seat for a lesser seat is going to involve weighing the inconvenience of the seat change against the apparent need of the person asking for the change. You are assuming that a change to a window is merely a minor inconvenience because that is all you consider it to be. I don't consider it a minor inconvenience, and the need for a seat across the aisle from a disabled child (who is already seated next to her mother) is, at first glance, seemingly unimportant. I suppose I could be convinced otherwise, but on its face this change seems like a big inconvenience to me (I would actually change flights if I had time) for something that doesn't seem incredibly important for the person seeking the change.