Most Qatari families don't want their children to marry foreigners. So what. Its their perrogative. Qatar has a indigenous population of just over 200k. Perhaps, they are afraid of losing their culture or heritage..Again its up to them..

Qatar is still a young country.. It wasn't that long ago that Blacks and whites were not allowed to marry in the USA or South Africa..

Times change and I am sure Qatar will evolve gradually..