It definitely gives me the feeling that the popular solution will be something xenophobic. Maybe there's hope for less knee-jerk reactions, like some regulation

It definitely gives me the feeling that the popular solution will be something xenophobic. Maybe there's hope for less knee-jerk reactions, like some regulations where when you lend money, the source of that money must be properly tracked. That way when someone claims a mortgage or lien on a house, it won't be respected unless the money lent was confirmed to be legit.