Immigration doesn't anger me.
Illegal immigration doesn't anger me either.... HOWEVER that's because I already live here.
As it is, Illegal Immigration makes it so that people make it harder for other immigrants to get here legally and rob the country of a more diverse population. (since heavily favors nearby countries.)
Illegal immigrants are counted as part of the census and effect immigration numbers.
Additionally, the people who come here essentially live as second class "citizens" with no basic access to things like healthcare and are easy victims for abuse.
If I was poor in Zimbabwe or Zambia or Gaza or something with no country that's easy to sneak too, poor and looking for a way out...? I'd be super pissed.
That said... it is a shame that we don't have 12 million or so more legal citizens of mixed nationalites here. Racial diversity mostly seems to have positive benefts, and racial diversity goes way past "Not white".
