They import illegal drugs. The locals snap. There is a riot. They are accused of racism and zenophobia. The press condemns the locals and calls for greater tolerance.
Nothing is done.
The immivasion continues, social polarity hardens, the quality of life worsens, the problems get bigger with every passing day. The locals feel like strangers in their own country. And the local racist zenophobes are not Americans, but Spaniards.