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Well one of the ""biggest taboo"" ie -eating meat of cows happened in vedic times, as is substantiated by historic texts and references to feasts in ancient texts - (however one professor was beaten for publishing a book with proof on this by Bajrang Dal activists). The other taboo is not really taboo for all Hindu's. In a very small minority no doubt but there are sects / tribes that are Hindu and bury their dead. So these taboos do not ""prove"" either point of view.  "