They make perfect sense, here is a short explanation: the origin country of said immigrants was unpleasant specifically because of the people there (eg: rapes, murders, criminality, etc), and if you import the people from there then your country will similarly become unpleasant (eg: more rapes, more murders, more criminality, etc.)

The civilizing process occurred in Sweden with Swedish people and it has been observed that a similar civilizing process is not occurring in the same country (Sweden) with different people (MENA immigrants) even over N number of generations.

Ergo: to make Sweden more pleasant, uncivilized immigrants must leave by crook or hook.