Time for reviewing thoughts:
Crystal Skull does use that, thank goodness. Indy’s had a lot of sadness and disappointment, personally and professionally, in the 19 years between Last Crusade and the events of this film…hell, from the end of Raiders on. Many men in his government don’t trust him, even though he was decorated in World War II. (“How many of those medals did you deserve?” one G-man asks.) He’s upright and trustworthy, but surrounded by turncoats, double agents, people who plum don’t earn trust, and the congenitally distrusting. It’s telling in a thematic way that Indy’s nearly killed by his own country’s weapon, which is why I forgive the silliness of how he survives the freaking nuclear blast: Indy has to stay on his toes around almost everybody, unable to expect that anyone else can rescue him, and that’s aged him.
+ Footnote: This makes me want to quote Repo Man:
MILLER: I'll give you another instance. You know the way everybody's into weirdness right now? Books in all the supermarkets about Bermuda Triangles? UFOs? How the Mayans invented television? That kinda thing?
OTTO: I don't read them books.
MILLER: Well, the way I see it, it's exactly the same. There ain't no difference between a flying saucer and a time machine. People get so hung up on specifics, they miss seeing the whole thing. Take South America, for example. In South America, thousands of people go missing every year. Nobody knows where they go -- they just, like, disappear. But if you think about it for a minute, you realize something. There had to be a time when there was no people, right?
OTTO: Yeah. I guess.
MILLER: Well, where did all these people come from? Hmmm? I'll tell you where. The future. Where did all these people disappear to? Hmmm?
OTTO: [doubtfully] The past?
MILLER: That's right! And how did they get there?
OTTO: [laughs] How the fuck should I know?
MILLER: Flying saucers. Which are really?... Yeah, you got it. Time machines. I think a lot about this kind of stuff. I do my best thinking on the bus.