What's the difference?
Seeing immigrants as human beings means seeing Pablo (married to Maria), with his 6 year old son that likes Trucks and 4 year old daughter that likes dolls, Edwardo (married to Suzanna), who has a 9 year old son that loves sports.
Seeing them as population means seeing 4 adults and 3 kids (interests of stranger's children is irrelevant to me; I don't care so no need to bring it up), not wanting to kick the adults out even if undocumented, but not giving them welfare even if it means their kids starve because your personal lives in harmless cases are irrelevant to me. I don't care about where you are from; be fiscally productive and take care of your own kids.
Immigrants aren't human beings; they are population.