I still don't quite see the "it was an accident" - I guess I believe Ennis too much. But the interview didn't really settle much, except that it IS ambiguous:
Ennis is convinced that Jack was murdered with a tire iron. I don’t necessarily believe it.
McMurtry: It’s what Ennis is feeling at the moment. But Lureen’s explanation is just as good. A lot of tires blow up and kill people.
** That's not a clear answer, especially if he adds that Lureen's is just as good. DO a lot of tires blow up and kill people?
Do people hope Jack wasn’t murdered? What do they believe?
Ossana: We’ve been asked that [in every interview]. You can’t believe the things we’ve heard—for example, did Lureen’s father have him killed? A reporter walked up to me and said, “What really happened? I need to know.” I said, “What do you think?” He told me, and I said, “Well, if that works for you, then good.”
**She didn't answer the question, did she?
Oh, that’s the most hateful writer answer.
**Exactly.
Ossana: But even Annie will tell you it’s ambiguous to her. When you see that [flash] on the screen, we tell people that [we don’t know] what actually happened to Jack. But it’s what Ennis thinks, and he’s been set up to think that by his entire past. This was his biggest fear, that something would happen.
**Annie does agree it's ambiguous, as does nearly every person I've talked to. Ossana doesn't know, and she kept that point ambiguous in the screenplay very well.
**Indeed. It's Ennis's conclusion, and he reaches it twice in the book, once in the movie. It may or may not have happened as he imagines, but to assume that it didn't because that makes you feel better? That's puzzling to me. To assume that it did, because that makes you hurt 'better' is also puzzling.
And the tragedy is multilayered. If Jack was killed that way, the guilt that Ennis must feel—maybe if he’d taken him up on it, this wouldn’t have happened. But also the fact that he’s not sure. What is more tragic than not knowing how your loved one has died?
**This is the 'it adds to the tragedy' line of thought that I personally favor, irrational as it is.
-backtobrokeback