Politicisation is a concept in political science and theory used to explain how ideas, entities or collections of facts are given a political tone or character, and are consequently assigned to the ideas and strategies of a particular group or party, thus becoming the subject of contestation. Politicisation has been described as compromising objectivity, and is linked with political polarisation. Conversely, it can have a democratising effect and enhance political choice, and has been shown to improve the responsiveness of supranational institutions such as the European Union. The politicisation of a group is more likely to occur when justifications for political violence are considered acceptable within a society, or in the absence of norms condemning violence.