Character mistake: When Gobler informs Dietrich about the preparation of the Flying Wing, the former calls the Colonel "Herr Major." (01:16:25)
Character mistake: In the original Latin Spanish dubbing, Dietrich calls Gobler "Glober" while walking next to the destroyed Flying Wing.
Answer: Indy and Marcus Brody believed that the Ark needed to be studied. They certainly didn't want to put it back where it was found. They believed that the U.S. government would find the best archaeologists, researchers, and scientists in the world to study the Ark. They are both upset that instead, the government has decided to simply lock the Ark away. This is why Indy says, "Fools. They don't know what they've got there," as he is leaving the building.
BaconIsMyBFF