Lorraine gets away with...(SPOILERS)
SPOILER ALERT! Numerous spoilers below! Don't say you haven't been warned! In capitals, italics and red yet!
When Ace in the Hole was released in 1951, the Hollywood Production Code was still very much in force, cracking only very slightly. I've always been amazed, therefore, at an incredible lapse in the Code's enforcement in this film of one of its most important regulations: that people must be punished for their crimes.
After her husband dies, Lorraine simply walks away from the trading post, trying to hitch a ride to another life...this, just a short time after she has stabbed Tatum with a scissors -- a wound which, left untreated (apparently an act of atonement-by-suicide by Tatum), kills him that night.
True, she stabbed him only in self-defense, after he had been choking her with the stole her husband had bought her for their anniversary. And granted, Tatum was still alive when she left, and she had no reason to believe he was as badly wounded as he was, or that he wouldn't seek medical attention before it was too late.
Nevertheless, however accidentally or justifiably (or unknowingly, since she left before he died), she did kill Tatum, in slow motion if you want, and according to the Code should have faced some kind of punishment for her crime, even if only a trial and acquittal or some other legal inconvenience. Hey, I'm not talking logic, I'm talking the idiotic Production Code. By its own standards, Lorraine should have to pay somehow. Yet she just leaves, and it's clear at the end she'll suffer no consequences for her act -- an astounding gap in the enforcement of the Code's usually rigid precepts.
While it was always known that the overseers of the Production Code were a pretty dim bunch, the fact that they allowed so obvious a violation of the Code to get by is truly astonishing. Not complaining, mind you -- I'm damn glad they missed it! -- but it's really quite surprising.