This could be because I have the flu (after getting the shot, too), but I see a connection between the kind of culture that results in 'honor' killings and what quite a few guys here say to each other when they get angry.
An example of the latter from Eschaton comments threads:
You know, your sister gives lousy blowjobs.
But you knew that already, didn't you?
That's the Z we all know and love! Good to have you back.
(I sort of feel like the guy who dangles a drink in front of the recovering alcoholics nose.)
And that thing I said earlier about your mother, I didn't mean it. After 8yrs in the ground, her puss doesn't smell half as bad as it did when she was alive. The necrophilia fetish was her idea, though...
Note how the attacks are against the other man's female relatives and their sexuality? You insult a man by insulting the sexuality of his mother or his sister or his wife. Probably his daughter, too. But you don't insult the sexuality of his father or his brother or his son. Interesting, is it not?
These slurs are not the same as a culture which assigns women the whole burden of honor in the family, but it's not that terribly different, either. Same roots, perhaps? It would be an interesting study to see how many people actually hold those views, clutched deep inside their puny hearts or something, and to look at their cultural backgrounds. The view of family honor as lodged within the women's genitals is supposed to have been prevalent around the Mediterranean.