There seems to be a lot of naievity here about what the purity of the news, media and tv organisations is. None of this has anything to do with an individuals integrity as a photographer. If they are paid staff they'll do what is "expected" of them. Freelancers will do what makes them money. There must hundreds and thousands of cases where the photographer or news/media/tv organisation was NOT found out. Welcome to the real world!!!
I don't really think being naive is the real issue or total cynicism either. I think most people know and understand the point of view issues.
But within that there is an acceptable balance we sort of expect. Something like the Iwo Jima picture. We all know it was a redo. But it wasn't a lie.
The sailor kissing the girl on the street at the end of WW2. If I was the photographer walking down the street and saw a couple hugging and celebrating, I might have said. Give her a kiss. And made history with it. Was it a lie. Was it real. Well it was sort of real and the celebration was going on.
We know the photographer in the original post that altered the colors of the funeral processions, didn't alter the people in the picture to change the underlying picture. So he may have altered the mood but didn't change the intent.
So I'm not sure we are naive. It's just that different genres have certain expectations, and we hope that they are adhered to on some level and the WPP does too.