If the Gypsies went to LA in WWII, why are there few problems with Gypsies in southern California? I've lived here all my life, and every year there is a story in the papers about the "Johnson families" but Gypsies here, such as they are, seem to stick to fortune telling and related scams. Maybe it's because most driveways here are concrete!
Having the opportunity for regular employment at good wages can have that effect. Several years back I met a fellow peddling hightech equipment for a Silicon Valley company ~ he was named Majoram and his father had grown up in a traveling wagon.
You have to remember, Gypsies, as a people, have been subjected to intense persecution and isolation from mainstream life for a long time.
Much of their less savory behavior is a reaction to their lives' conditions.
BTW, not all the folks in fortune telling are Gypsies.