Right handers form a significant majority; left handers are a small portion of the population. A position that is far from accepted norms or odd is considered leftfield. Right means correct, left is suspect. The conundrum of the traditionally weighed out equation put forth is that the right is often rejected and yet the left still always remains a minority position. If it does not, an overthrow occurs and new structures form.
The political terms right and left come from the seating in the parliament of pre-revolutionary France. The Estates-General was divided into three sections: the nobles, the clergy and the commoners' representatives (all rich, btw). The commoners reps sat on the left, the first estate on the right and the second in the middle. The left were revolutionary and declared themselves to be the new National Assembly and did a liberal amount of noble butchering and so on it revolves...
Cultural left: Opposition. Minority position that purports to support the interests of the (disenfranchised) majority and generally promotes centrifugal forces; threatens cultural maxims, seeks breakup of high concentrations of private wealth and existing power structures through subversive force; rejects stagnancy, seeks the advancement of novel pluralism. Group often asserts social and ethical superiority through rationalist human-centred philosophy.
Cultural right: Centrist majority supporting the currently ruling parties. Usually a centripedal agency that looks to maintain existing cultural framework and power structures. Characterised by the strong support for the observance of ritualistic, habitual thinking and behaviour. Group often cites interpretations of millennia-old mystical texts to assert moral authority.