Why do we need to quantify an exact quota to qualify as well thought out political thought? Some people think about this issue from the basis of fundamental freedoms. Innocent, productive people deserve the opportunity to move where they obtain the most prosperity.

If I advocated abolition in the 19th century, it would be missing the point to turn around and say "oh yeah? And how many slaves would you like to free per year, and what effects do you expect that to have? Include examples of past slave rebellions"