Here we are talking about GIRLS or WOMEN BEING KILLED ONLY FOR MARRYING SOMEONE PARENTS DO NOT LIKE. It’s your problem if you believe that a verse from Quran that TALKS ABOUT ADULTERY AND NOT MARRIAGE is behind that. As far as Muslims are concerned then these two scenarios have no link whatsoever. All the well known Scholars in Islam agree with the verse in case of second scenario (ADULTERY) but you will not find a single who would look at (HONOUR KILLING) in the light of your given verse. Because very simply there is no honour in killing your own children for something you do not agree with.
However if I agree with your ASSUMPTION then which Quran is influencing minds of HINDU, SIKH and even CHRISTIANS because no one can say that this malpractice is only among Muslims? As far as I know it is cultural issue, mainly in very remote areas or among people from remote areas even if they have now moved to the cities of India, Pakistan, Bangladesh, Sri Lanka, African countries, Europe and USA or anywhere else.
If my disagreement with your opinions makes you believe that I am un-reasonable or insulting then that is naive thinking and nothing I can do to avert that.