In one of the earlier scripts, an exchange between Vito and Michael gives a much better insight as to why Vito felt the way that he did about country and government. In it Vito tells Michael :


"Believe in family. Can you believe in your country? Those pezzanovante of the state who decide what we shall do with our lives? Who declare wars they wish us to fight in to protect what they own? Do you put your fate in the hands of men whose only talent is that they tricked a bloc of people to vote for them? Michael, in five years the Corleone family can be completely legitimate. Very difficult things have to happen to make that possible. I can't do that anymore, but you can, if you choose to.
Believe in family, believe in a code of honor, older and higher, believe in roots that go back thousands of years into your race. Make a family, Michael, and protect it. These are our affairs, sono cosa nostras, governments only protect men who have their own individual power. Be one of those men...you have the choice."

It really gives you a much better idea as to how Vito felt about government and family.