Maybe he was pissed because he anticipated that the war would interfere with the family rackets. If he were at all farsighted, he would have foreseen that the war would create tremendous new opportunities for racketeering.
I dont think sonny was too boterd about that. He did say business would have to suffer when he was waging his war on the five families. I agree with Pizzaboy that Sonny just said it because he lived in the country, Nothing to do with the love for his country.
