Critics have argued that loyalty to democratic values is too weak to preserve a deep bond to unify a state. This is because it is missing a key feature of individual identity for modern subjects - nationality, which in turn provides national identity; "essential for realizing important important liberal democratic values such as individual autonomy and social equality." They believe national identity is the base on which political morality can be achieved. In response to this, it has been questioned whether or not the nation should be responsible for the unity of a state.