The previous socialist Spanish prime minister did a full-scale amnesty for the many illegals in Spain (which meant they could then go anywhere in the EU). This new one is just getting started. He might even do more to destroy his country.
These hordes arriving in southern Europe don’t want to stay there; most make a beeline across France and try to get to England. This played no small part in the Brexit vote.
Easy for Spain and Italy to simply let them pass through...