This is about 50% of the whole discussion, the other 50% is the fact (that Adam brought up in the beginning) the government is the real initiator, not the immigrants. When Stefan responded with "but immigrants bring in more crime" Stefan is making a collectivist argument AND a strawman. (Illegal) immigrants coming into the country are not the real initiators in this situation, not even when we accept that they generally bring in more crime and have higher rates of crimes within their own population/group. The real initiators are the immigrants who commit [immoral actions], so not all of them. That is the mistake and strawman Stefan made.
In this debate Stefan has subjectivized UPB and until he rectifies this, I, unfortunately, cannot take his word too seriously anymore.