How exactly do you know all this? You sound like an evangelical anti-abortionist hypocritically bringing up the abortion of disabled foetuses, which is a touch ironical. Incidentally, the headscarf is called a hijab. The niqab and burqaare the ones that conceal the face.
It's out there. On discussion forums, in the news media. Women from these communities are trying to protect each other, call it out as an honour crime. The first time I came across it personally was when my best friend's cousin went to India to abort a daughter because she couldn't get an abortion here. My friend wondered if she would have to do the same. We were 14, 15 I guess.
If you want to read about it there's some info here.
https://jech.bmj.com/content/jech/early/2018/06/19/jech-2018-210622.full.pdfIncidentally, I don't disapprove of them having the abortion because the likelihood is that life will be shit for them if they have the child, and for their daughter too, unless they are able to get out of the marriage safely. Its the whole culture that needs changing, an our response to 'cultural sensitivities' that are actually excuses not to deal with abuse.
But we are getting off the topic of marriage. Should you wish to continue, start another thread.