All political jurisdictions, especially sovereign countries, but also states, provinces, or even cities, should be allowed to set up criteria (so long as it does not involve the use of ethnicity or gender) for determining which immigrants to allow to enter and live inside, and which to reject. For example, criminal history should be an acceptable parameter to use through which to filter immigrants.

There should also be a questionnaire and statement of principles that immigrants (and even natural-born citizens upon their reaching the age of majority) be required to fill out and sign so that this could serve as an additional measure by which to ‘screen’ people so as to help ensure that only people with ‘safe’ beliefs are admitted into the country.