Possibly rodents are doing this damage .. poor little birds! Check your loft very carefully for any openings even remotely large enough for a rodent to get through .. you'ed be amazed at just how small an opening they can take advantage of. Have you brought that little one inside and are taking care of it? The little pigeon does NOT look fine to me .. the eyes are dull and not wide open .. I think that little one is in pain and in shock.
Terry
Terry