They should be taught how the present process of voting and legislation came about IE the history of it but not about the political parties per se as they seem to change their views every 5 minutes so what can you teach them about that?
Next stop presumably, from your point of view, will be to ban these 'retards' from voting at all. The basis of our democracy is that you vote for whomsoever you wish for whatever reason you wish, even at the risk of being labelled a 'retard' by you. Just because their judgements might be different to your own does not mean they are all retards. Come down off your high horse, GANDALF <|:-)>, what superior knowledge do you possess that allows you to insult any other voter?