Selecting immigrants doesn't work, in my opinion.<p>Regardless of the selection criteria, any screening will deter "desirable" people. It will not deter those who choose to circumvent that process, especially those who immigrate "illegaly" or "irregularly", like refugees in Europe, who are not eligible for asylum, but can't be deported for all sorts of perfectly valid reasons.<p>In the end, and we see this all over the world, such screening leads to adverse effects even considering the intended screening criteria.