Re: …Son vs. Daughter…
It’s amazing that no one in those villages thinks that if you keep having boys and keep killing girls, you’ll end up having more boys than girls when they all grow up and are looking for someone to marry. 
No matter how hard we try, the truth is that men in this world are decreasing (wars) and women are increasing. I can’t quote the exact hadith, but I believe there will be time when the ratio will be many (I think 50) women to one man.