The fact is if Hitler did not target the Jews you would not care.
My ancestors are Slavs. My cousin is a lesbian. One of my best friends from elementary school is in a wheelchair. I would care.
Futhermore, even though I have no personal connection to anyone who might be called a “Gypsy” (whether or not they self-identify as such) or to Jehovah’s Witnesses or Communists, I am not okay with them being killed because they are in that group. I would care.
And, yes, the Germans did target Jews. And they managed to kill millions of them. I care about that, too. The owner of my company is a Jew. I don’t really feel a personal connection with him, but I still don’t think he and his wife and children should be killed or harassed because of the ethnic or religious group that he belongs to.
The U.S. at the time of World War II was, by modern standards, quite anti-Semitic. See
Gentleman’s Agreement (1947), starring Gregory Peck, for an American look at American anti-Semitism.
http://www.crf-usa.org/bria/bria10_2.html#hitler
In 1938, more than 300,000 Germans —mostly Jewish refugees —had applied for U.S. visas (entry permits). A little over 20,000 applications were approved. Beyond the strict national quotas, the United States openly denied visas to any immigrant "likely to become a public charge."
When I was at Texas A&M University, Dr. Arnold P. Krammer showed my class a newspaper article in the New York Post (I think) entitled (and I’m paraphrasing) “Largest Massacre in Recorded History Occurs in Poland”. It was on page 16. I think the headline for the day had something to do with baseball. Please note that I’m not a reliable source here, but you could probably track down and email Dr. Krammer if you want better data. Be aware, though, that he is Jewish and lost relatives in Hungary. I doubt that he will tolerate neo-Nazis lightly.
http://www.religioustolerance.org/chr_prac2.htm
Polling data from the 2001 ARIS study, described below, indicate that 1.3% of Americans are Jewish.
I’ve never actually met a Holocaust denier in America. They are fairly rare. To suggest that 1.3% of the population somehow planted the seed of “Nazis = bad” all by themselves is beyond absurd all the way into psychotic.
Don’t think that America hasn’t considered the question of Nazi atrocities before. We turned a blind eye once. We’re not going to do it again.
ETA: I recognize that not everyone on this forum is American. I have neither the academic knowledge nor the experience to speak for other nations.