So what?  While staying together "until death do you part" made sense when we married at 13 and died at 35, it doesn't make as much sense when we marry in our twenties and die in our eighties and ninties.  Men and women grow and change as the years go by, and as they spend more and more time together it's unlikely that they will "evolve" in the same way and in the same direction.  While obviously, if you still love the person, you should try and make the relationship work, if you've found you've drifted so far from your partner that you no longer love them, then by all means divorce.  Why live with constant fighting and bickering?  It's not healthy for the couple or any children involved. 

Also, given that Saudi couples aren't even given the opportunity to get to know one another before marriage, it's hardly surprising that so many should divorce in a year.  And better to call it quits after 6 months together than to bring children into a loveless marriage.  I would say calling it quits is the mature thing to do.