Excellent book -- I'm in the middle of it right now after Tancredo recommended it.
One of my favorite quotes is at the beginning from Michael Dibdin's "Dead Lagoon":
"There can be no true friends without true enemies. Unless we hate what we are not, we cannot love what we are. These are the old truths we are painfully rediscovering after a century and more of sentimental cant. Those who deny them deny their family, their heritage, their culture, their bithright, their very selves! They will not lightly be forgiven."