Source? Or are you just talking about modern indigenous people looting their ancestor's archaeological sites?
Found it:
https://www.getty.edu/conservation/.../newsletters/33_1/endangered_archaeology.html
Admittedly a decent chunk of it is also a lack of interest in digs, but a combination of that relative lack of interest, Colonial fuckery, regional instability, wars, and population growth is really fucking up that region's potential sites.
As for my thoughts on Crystal Skull... I consider it a flawed and sort of bad movie. I'd argue it's a bit more watchable than say Phantom Menace, but its biggest flaws were it tried to both do a 50s sci-fi film AND be an Indy film, when it should've been an Indy film with aliens. That Lucas had the theme be crystal skulls didn't entirely help IMO, since those were absolute fraud and only one wasn't debunked by that point due to the asshole owning it being real cagey about letting people investigate it and it was the one thing they got money from.
Like Indy finding aliens? Weird but easily doable given Raiders and Temple of Doom. But tbh I'd have gone with the angle that it was the search for El Dorado and not those skulls, and you find out that the chief creation deity called either Viracocha by the Incans, or Chiminigagua by the Muisca was an alien who survived the crash and aided them for helping him. Just make it simple by having a very unscrupulous treasure hunter as the bad guy (have it be Mac, why not), and it'd have worked out fine. Especially if you have Harrison be a bit more like how Connery was in Last Crusade, since he can't quite do physicality as well at that point.
But at the end of the day it was a somewhat unfocused mess made by a writer who didn't really have many to question him, and a director who didn't want to make a fourth movie anyway. It had heart at least, which is a shitload more than I can say about this one, which had the BBC describe it as "A miserable and broken old man being mocked by his unlikeable goddaughter".
It essentially resulted in Fleabag having to go back in time and do all the stuff Indy did in the previous movies because he was literally erased from history. I'm not sure that's the real ending, but the mere fact that it seemed plausible speaks volumes.
From the fact the ending was reshot I strongly believe that they originally were insane enough to actually erase Indy, but somehow they realized just how suicidal a move that would've been and tried to blunt the blow.
I really don't get where people think Kathy can run anything; her independent projects have as of right now always came in overbudget due to her stepping in and forcing mass reshoots.
Also I love how the film is so horrid that even the positive reviews have to admit the first two acts sucked and were boring and miserable.