Yossi Klein Halevi in his book Memoirs of a Jewish Extremist wrote that in his father's eyes the real criminals of the Holocaust were the American Jews, especially their leaders. 

"They knew what was happening; why didn't they chain themselves to the White House, sit down in the streets of Washington, lose their minds with grief?  "And what did they do, these leaders, do-called leaders, these nothings?  Dance at bar mitzvahs?  what did they do!  Instead to be died and winded itn eh White House while every day, every day, thousands more were burning."...

American Jews didn't try to save the relatives they'd left behind in Europe because they didn't want to draw attention to themselves with a noisy rescue campaign, jeopardize their assimilation into America.  The six million American Jews had survived in place of the six million of Europe; we had burned so that they could move to Long Island.