In Saudi Arabia (and all the other Arabian countries such as Oman, Yemen, UAE, etc), the tradition is for the men to marry their father's brothers' daughters, i.e., their paternal cousins. Many people think this is a fine tradition and refuse to let it die, as it ensures there's more women for the clan, something that's extremely important in a country where polygyny is the norm which means that there simply aren't enough women to go around. Their historical 'solution' is to send the extra men Somewhere Else to cause trouble. A few of those men end up joining the Taliban, ISIS and similar, but as long as those young men are causing trouble Somewhere Else and not home, Saudi Arabia and the others don't care.
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Many nations still have this problem with incest.
In Saudi Arabia (and all the other Arabian countries such as Oman, Yemen, UAE, etc), the tradition is for the men to marry their father's brothers' daughters, i.e., their paternal cousins. Many people think this is a fine tradition and refuse to let it die, as it ensures there's more women for the clan, something that's extremely important in a country where polygyny is the norm which means that there simply aren't enough women to go around. Their historical 'solution' is to send the extra men Somewhere Else to cause trouble. A few of those men end up joining the Taliban, ISIS and similar, but as long as those young men are causing trouble Somewhere Else and not home, Saudi Arabia and the others don't care.