My guess is, when you choose the world and greed over common sense, you prioritize what you want as a parent and ignore what your children want as human beings, weird things happen.
One of the things earlier Christians criticized Islam for was the liberal attitude towards sex. First, Allah made marriage legal so one to prove their obedience, they should not give up on marriage and become celibate. Second, as long as a man can have sex and satisfy a woman, the prophet said to the parents to marry him without burden. The hadeeth was" if someone you are pleased with their character comes to you asking for your daughter's hand, marry him" or something close to that. So, there should be no condition to let young people marry and enjoy life. If you prevent young adults from experiencing life as human beings as they should, they will find ways to meet their needs and most of the time it won't be something society approves.
These Saudis mostly want expensive dowry and don't allow anyone else outside immediate clan or relatives to marry their own. They don't allow non-Saudi Muslim to marry their women. Widows and divorced women are condemned to stay single forever to their death. They are paying the price. Racial bigotry, clan bigotry, greed all combined have reared their ugly heads in that society. And they look sickly to me anyway from intermarrying for generations. Talk about a disaster.