Why ideology is important in stratification?

Ideology is socially constructed and those who are in power make it. This an insight from sociology. Let me give an example. Those in power, obviously, want to keep their power. So, what they do is try to create a commonsense view of the world that basically says that the world is the way it is supposed to be. The rich are supposed to be rich, because of certain reasons, and the poor should be poor.