It should be adopted by all countries.
The world has gone mad, this open door policy (or similar) doesn't work, some nationalities can't/won't assimilate in other countries, they misbehave, behave inappropriately, then we see riots.
The Sydney Cronulla riots is a good example and there was the recent unrest in the UK, now some are calling these poor people who have been antagonized and provoked, 'FAR RIGHT'.
People just want their normal society back.