"Noir" is predominantly a marketing term now. Dangerous Crossing is a straight up Woman's Picture. They're putting the noir label on anything they can, but I don't mind, as it means they're releasing things they wouldn't have released otherwise.
I've come to the conclusion that Noir is Pan Generic and subjective. Its a dark story told in a visually stylistic manner with enough of those elements that appeal to an individual that will tip (or tune) it Noir for them.
For me
Dangerous Crossing is a Woman's Noir. Though in reality over 95% of violent crimes are committed by men. Realistic dark stories about women will be about adultery, fraud, theft, bunco, vice, addiction, non violent crimes.
In a Lonely Place and
Sweet Smell of Success are Drama Noirs for me.
I agree that "Noir" has become a marketing tool.