What I mean is that the deleterious effects of the policy are established, even if some of the problems are not fully quantified. So the debate should be about the need to control or limit immigration ; and even if such a need were "proven" (which will have to depend on a whole lot of assumption about what is "good" for a country), whether the policies being applied are not overly harsh.

Un roi sans divertissement est un homme plein de misères