> they are talking about the dangers of "chain migration" which is exactly what his family did to great success
Where is the contradiction here?
Well they did it and got prosperous by successfully contributing to the economy and improving it for all of us.
In Binghamton there are Turkish immigrants who run Middle Eastern restaurants which our extended family love to go which are so much like the Italian restaurants that Italians still run and I'll see a teenager hanging out there who seems so much like an Italian teenager.
A person seeing that similarity could (and should) have a sense of "these people are going to come here and contribute and pay taxes and grow the economy to help support me" which is what the outcome is most of the time.
One is people's lived experience: "Hard-working families immigrate to a land of better opportunity and build a life for themselves, integrating as upstanding members of the community."
The other is nativist propaganda: "Hordes of scary 'aliens' are coming to take your jobs and destroy your way of life, bringing their drugs and crime and turning your neighborhood into a trash heap. They might even eat your pets!"
People have difficulty noticing that the second story is supposed to be a description of what they or their ancestors personally lived as the first story; people compartmentalize and sometimes believe the propaganda version even though it directly contradicts their lived experience.