Abstract
The mirror symmetric theory of neutrino mass (or left–right symmetric theories as they are called in the literature) was proposed in 1974 and 1975 to understand the origin of mirror symmetry breaking by the weak force. Its connection to neutrino mass came later in 1979. Why was it necessary to think along these lines when the standard model is so successful? Sometimes, speculations about the next level of physics are not determined by experimental facts, but rather by expectations based on aesthetic considerations and conceptual shortcomings. For example, a huge amount of activity right now focuses on the attempts to understand why the mass of the Higgs boson does not become arbitrarily large due to quantum corrections, although from a strictly experimental point of view, there is no need for such thinking.
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