The state has a duty to maximise freedoms.  All states in some way limit individual freedoms, by requiring them to follow laws and enforcing these laws with the coercive power of the state. However, such limits can be justified in so far as they advance others freedoms; limiting Person A's freedom to kill enhances Person B's freedom to live. States therefore derive their legitimacy to deny freedoms from their advancement of overall freedom. This policy enhances the freedom of people to defend themselves and their family by providing them with information about offenders (see Argument Three), and allows them to determine for themselves the importance of that information1.  1 law.jrank.org, 'Sex Offences