"You can't handle the truth" - Colonel Nathan R. Jessep
Or another way of looking at it is that there is bad knowledge. Some things are fundamentally damaging to know, and once they are in your head you can't unsee them, rather like the hole of a missing tooth that your tongue keeps finding. The best you can do is try not to think about it. The question is, do you spread that knowledge, because people have a right to know or do you keep it to yourself to protect them from the damage.
With falling man we know that he either fell or chose to step into the void and that once he exits the building there is only one outcome. However the grisly finality of that outcome is unpleasant to think about and experiencing it through multiple senses makes it even more so. Freezing that moment whilst he is still falling is more than enough for most people as we can see from the reactions to that image. Having to listen to the impact, see the results or feel the concussion of their final act is more than most sane people would want to experience.
So we restrict what we show, so that people aren't exposed to the realities of existence as some of them are bad to have in your head.
Some time after 9/11 I was working for Reuters during the first gulf war. During the bombing campaign a bunker in Baghdad was targeted and destroyed. The following day the foreign news crews were rounded up and driven out there to the destroyed bunker. From the outside you could see it was covered in aerials and was probably a command and control centre.
Stop reading now if you are feeling sensitive.
and because it was safe the senior officers had their families stay there during the bombings. So the bunker was full of women and children that they carried out on stretchers covered in Iraqi flags. As the corpses were carried past the film crews the flags were removed, then replaced once they were loaded onto the backs of trucks. It took hours to recover the bodies and the crews were kept there filming until they were done. And then the footage was sent back to us for cataloging, never to be seen again most likely, just to take up space in the archives. But it must be catalogued, so you have to watch it, for hours....
There is bad knowledge that it is better not to have in your head. There are sounds you don't need to hear and sights that can go unseen, as for the other senses best to not even go there.
We in the west live a fairly sheltered existence where the news is sanitised and made as palatable as possible whilst still conveying what's going on. So it's even more shocking when we get shown something as graphic as falling man and our reactions, in many cases, say more about us than they do about the image.