Saintaw, I dismissed your first answer because I don't believe it's true. These aren't stupid or ignorant people. They're successful businessmen/women who owned/ operated multiple businesses in the UK, including a business specialising in human resources.
I don't think they're stupid. I believe they carefully thought this through over a course of time and decided it was in the best interest of their family unit. They intelligently made a decision, although of course I won't call it a sound decision because I don't think cutting the throats of one's siblings or children is ever going to be a necessary solution to any problem.
No, they're not stupid or ignorant people, but they're very different people from you or me. They're different, and of course you and I as modern, enlightened and educated people celebrate cultural diversity and at a bare minimum tolerate what we don't choose to embrace. Right?
So, if the core issue here isn't intelligence, what is it? Why did this happen,and what can be done to prevent it in the future? Like I said, difficult questions to answer without hurting somebody's feelings.