Saudi Arabian King Salman bin Abdulaziz has shaken his nation’s closed political system by making his youngest son his heir. Although heralded as a “modernizer,” 31-year-old Crown Prince Mohammed bin Salman, also known as MBS, is the architect of Riyadh’s disastrous attack on Yemen and disingenuous campaign to turn Qatar into a Saudi satellite. Given President Donald Trump’s warm embrace of the monarchy, Prince Salman’s recklessness is likely to draw the U.S. more deeply into destabilizing regional conflicts. The Kingdom of Saudi Arabia is an anachronism, an absolute monarchy in a democratic age. A few thousand princes sit atop a society of roughly 32 million, treating the nation’s wealth as their family’s piggy bank. The royals live a generally licentious lifestyle outside of public view, but buy off the KSA’s fundamentalist Muslim clergy by promoting the intolerant Islamic sect of Wahhabism worldwide. The kingdom’s population long has been a generous source of people and money fo...