You wonder if those posters are really so dumb or just impatient and desperate to get their name on the social media, so they would grab quickly any comparable picture. Unfortunately, there were other similar instances in the past, and no doubt, they will be more in the future.
We just had the phony pictures of the Amazon burning, many of them either not from the Amazon or taken a decade earlier and posited as current. Add phoney Dorian shots and pretty soon those polar bear shots also are suspect. So people become climate and Amazon fire sceptics. How many people decide not to evacuate before the next storm because in their head they remember that there's was something "phoney" about the reporting, maybe overhyped?
Getting back to photography, I wonder if it's more acceptable to distort news due to Photoshop? It seems so natural to replace elements of the real picture with phoney stuff. More importantly, since everyone doing it, what's the big deal from a moral standpoint if it's done by photojournalists to project a political point they believe in or just for the notoriety?