It wasn't their decision. They didn't know. Please read my post above.
These magazines had strict rules about that. W. Eugene Smith's altered photos of Schweitzer was rejected because of that, which pushed him to leave the magazine in anger and protest.
In absence of evidence, the photographer's feelings about this should not be made subject to hypothesis. He may not have cared, he might have been pissed. We just don't know. Implying one over the other is quite unfair to him.
You can’t say with certainty what Time, Life, People, etc. or the photographer knew and what happened. And I did say “may” proviso “probably” (given self interest).
Limited internet research is limited and Wikipedia is colored. Crime happens; the U.S. government and Attorney General’s guidelines are often broken; and despite compulsory grand jury rules at stake of criminal sanction, those are offended and violated. Despite serious repercussions and risk of reputation, people and organizations have self interests which some times are at odds to its public and hi-minded mission.
My cursory non-definitive Internet review gives:
John Filo the student photographer is reported head of CBS photography and formerly a picture editor of Newsweek. He’s had ample time to explain where and how it became converted, that is if he knew (I emphasize if he knew). Certainly he‘d be aware of the alteration given its publicity; some expect his professionalism, much less curiosity, to cause him to look about and clarify anything. Cursory Internet review doesn’t immediately provide investigation much less results of investigation to ”what happened” beyond a statement by David Friend who when Dir. of Photography with Life said the image came from its photo collection and was at one time airbrushed by someone anonymous “in a darkroom sometime in the early 1970’s”… and Life couldn’t get an image directly from Filo the photographer quickly enough before prInt. It all sounds shaky. Call me an always-skeptic unless there’s a lot more circumstantial or direct evidence in the presentation of what happened beyond some words of someone in the (albeit later) chain of command.
Friend added, “At no time would Life’s photo, art or production department intentionally alter a news photograph.” Study that caveat. But I get it. I’d be interested to read what the photographer may have said about everything. If nothing, why? His image, maybe he’s explained something about it.
On point (maybe alluding to straight photography, whatever that is)(to Sep. 11 imagery and impact), Friend encouragingly, said, “People are deniers of many things in life, but through pictures, we can see the reality of what happened that day. And no matter what conspiracy theorists or purveyors of fake news would have you believe, this really happened.”
Well, then keeping the fence post I’m guessing is the approved solution. That is straight photography to me.