"Still unusual for established West European democracies is the possibility of casting a negative vote (“against all”). The negative vote system stems from the communist tradition of non-competitive elections and is still used in a number of Council of Europe member states. It gives voters the possibility of expressing their annoyance with the candidates and parties/blocs on the ballot paper. In this way, however, political and party apathy in the population can be strengthened if the voters are able to simply reject candidates and parties instead of making the (often not easy) decision as to who is better (or best of the worst) candidate or party. As a matter of principle, voters should be encouraged to vote for their preferred candidate or party and thereby take the responsibility for the body that is being elected (see, for example, CDL-AD(2003)021, para. 31; CDL-AD(2005)027, para. 23; CDL-AD(2006)002rev, para. 78). "
CoE (Venice Commission): Report on Electoral Law and Electoral Administration in Europe, para. 142

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Report on Electoral Law and Electoral Administration in Europe