What would have happened if we found out at the time that the photo was modified? Some people would have exclaimed, "FAKE!". Would it have had the same effect on opinion in the country?
You'll notice I said I agree that such photos shouldn't be altered.
And whoever altered the photo thought it was justified - and a clean enough job that fooled the editors of major publications.
And in this instance, that this photo is not straight does not make it deceptive. As Alex said (correcting what I said above), the publishers would have wanted the unaltered photo. But it turns out the majority of people saw the modified one and were shocked at what it depicted.