Aren't you ignoring the current historical context? For example, consider the following: During previous waves of immigration,
There was an entire nation to fill up.
There was no welfare state.
There was no affirmative action.
There was no divisive philosophy of multiculturalism prevailing in the popular culture, in the media, and among the academics and other intellectual elites that influence public opinion.
Pat may be flawed, but so are your counter-arguments to his position.