He Knew He Was Crashing

In the beginning of chapter 7, Vonnegut tells us Billy knew the airplane was going to crash: "He knew he was going to crash, but he didn't want to make a fool of himself by saying so." (PDF)

"He didn't want to make a fool of himself by saying so." How crazy is that. If I knew I was going to be in an airplane crash, I would speak up. Why put my life and others in danger? Why does Billy keep quiet?

First Theory: Billy gives the impression that he doesn't want to live anymore. Until now, he has shown he doesn't care about the present or future. Ironically, he's the only one who survives: "His lips were working, and one of the golliwogs put his ear close to them to hear what might be his dying words. Billy thought the golliwog had something to do with the Second World War, and he whispered to him his address: 'Schlachthöf-funf.' " (PDF)

Second Theory:

BIlly simply learned death can't be taken seriously. After all, "so it goes." With death not being a big deal in life, there is no fear in riding a plane destined to crash.

Again, irony shows up. The person who takes death lightly and who knows the plane is going to crash, is the only one who survives.

A bigger question now arises. How does Billy know the plane will crash? This makes me wonder if his time travels are really true. How else could he know there would be an accident? Pure intuition?