Civil disobedience is needed in any society, since societies are, by nature, imperfect and always in need of reform. The "civil" part of civil disobedience is important too, in that there is a need for non-violent protest. It is a form of free speech, of constructive criticism of government or business policies, and helps bring about positive change.
In the US, where we have a founding document, the Constitution, civil disobedience is one of the ways in which we cna keep government honest to the original contract. It is a method of protesting what we feel are unjust laws or policies in hopes of making them just policies.