I guess that we are talking about the political ideology of right and left, some say that it is already over, although I am afraid that that is what they would like to. Two positions and political attitudes I based these on the concepts of Augusto Comte, French philosopher, founder of positivism in the 19th century. Comte speaks of human history necessarily through organic and critical stages. In the organic there is order and stability because there is no conflict between the dominant ideas and institutions. What happens in the criticism in which new ideas push to change to progress. The right wants social order because it is well installed. The left wants progress ( change of the above order ) because you want to improve society. Both on the right and on the left there is radical and extreme positions and moderate positions. But the confrontation is inevitable. Now well the different positions can exercise this confrontation with more or less tolerance and moderate right is tolerant, does not want to delete instead. The left wants to change society so that everyone and not just a few or more, but not all, can live better, with better economics, education, health, ultimately, with greater equality.