Vito should have taken the deal.
Its just a little Turkish heroin, what was the big fucking deal? He could've nodded his head and the five families would have become richer than God and probably taken over the entire City/State of New York. Than he could have all the Senator and Governor grandkids he could want. Instead he has to take a few, start a war, and the heroin trade moves into New York anyway. Bunch of chaos for nothing.