Are you truly incapable of discerning between attacks on overall immigration policy and views of immigrants themselves?
You know, it is a trademark tactic of the Left to brand someone as 'anti-immigrant' for merely voicing concern or objection to immigration policy. Its the same as calling someone racist or anti-civil rights for opposing racial preferences or quotas. Its completely bogus, but effective for the Left because it allows them to sidestep a debate over the actual merits of the issue.
Polls consistently show a majority or plurality of Americans opposed to giving amnesty, drivers licenses, and in-state tuition to illegal aliens, and in support of reducing legal immigration (notice use of the word "reduce" instead of "end" or "ban"). Since these are the maintream views that will get one reflexively branded as anti-immigrant, or "UberKonservative nativist" then I guess you think most Americans are such.
But as to this Marine; clearly he was a great man, and he should be honored for his bravery, service, and sacrifice. But to use his example in the argument over immigration policy invites examples of 'bad' immigrants who come here and become criminals.
That's why its best to look at the overall policy and its effects on the nation as a whole.