Engelhard’s unease is likely shared by the majority of Americans, though few people talk or write about it publicly. Tellingly, Engelhard’s op-ed was not published on an American website, but rather the Israeli Arutz Sheva (Channel 7) site.
Culture, and the impact that mass immigration has on it, is a difficult matter to discuss. These are issues that can be easily demagogued by those on the fringes of the immigration debate. But that does not mean we should not have a national discussion this sensitive, but important topic.
Engelhard has started that discussion. You can read it here.