From their point of view such recommendations keep the marriage together, the family stable and the honour of the society intact. Such benefits are more important.
No consideration for the woman really.
That is why Islamic teachings need to be exposed so that some of it can be diluted. We we need skip past the rhetoric of respect to ensure future generations are no longer subjected to intimidation and abuse.
One of the major problems in Islam, IMO is the whole group/clan mentality. Yes, community cohiesiveness is good but when it's entirely at the expense of the individual then it will eventually break down. What modern Islam needs is a middle way between the welfare of the clan and the welfare of the individual, unfortunately since individualism is seen as a western decandance this, too will take time to come about.
In the meantime more girls and women (and some men and boys, I admit) will still suffer at the hands of their parents and community 'elders', their hopes and dreams washed away by the overwhelming tide of honour.