Anti-immigrationists tend to argue that the immigrants are not fulfilling term number 2. They are not making a sincere effort to assimilate, and too many of them stick to intolerant and bigoted worldviews. Therefore, the host country has no reason to fulfill term number 3 (to treat them as first-class citizens), and has every reason to reconsider term number 1 (to allow them in). If people from a particular culture have consistently proven themselves unwilling to live up to the immigration deal, why allow more of them in and create an even bigger problem?
