I'll note that both photoshop and changing the timestamp of images (mentioned below) are only easy for a very small percentage of the population. It'd likely be different if >30% of people could easily do these things.
I'm currently the originator and lead on a project that will have huge impact on our bottom line. The team is mostly junior people, so when I presented the plan the response I got wasn't "I didn't think we could do that", it was "I didn't even know that that is a thing".
There used to be a joke about Rumsfeld's "known unknowns" vs. "unknown unknowns", but it's so true. And to the vast majority of people in the world the question isn't "how" to change a timestamp, it's understanding that a timestamp can even be changed.