Many come from impoverished no-hope towns on the East Bank, a world away from the sophistication of Amman.
"When millions of people - especially youths - are impoverished with no hope for the future, the risks of instability and extremism grow," he added.
Those who are impoverished have no one to blame except themselves, so the narrative goes.
His student days in Prague were impoverished; with no piano in his room, he had to make do with a keyboard drawn on his tabletop.
"This is an incredibly impoverished country with no institutions, no economy and no cohesion; to expect a coherent state is to expect the impossible," Professor Dupont said.
What's true, though, is that when millions of people -- especially youth -- are impoverished and have no hope for the future, when corruption inflicts daily humiliations on people, when there are no outlets by which people can express their concerns -- resentments fester.
For every night when something of the old magic fleetingly sparked, there was a disaster like the 2010 Coachella appearance, which took place just after lurid reports appeared in the press suggesting Stone was impoverished and of no fixed abode, living in a camper van parked on a street in East LA.
Griffin died in 1937 after a botched gallstone operation, and she ended up so impoverished that no marker was placed at her 1961 gravesite in Chicago.
With Bray he could be frank, certain she would understand him, about the nostalgia he felt for a time when he was practically unknown, impoverished, with no prospect of ever finding a public.
And impoverished single mothers have no greater political clout than economic clout.
