Why not? We can collect random samples from black communities, and see if inferences can be made about the population. ... Probability and Statistics.
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Truth is wherever you live, you are living in a caste system.
Castes have evolved to present day classes: Upper Class, Middle Class and Lower Class.
Although, you have the freedom to go from one to the other, it‘s quite difficult. Each class has its professions, some overlap. “Interclass” marriages are uncommon. There is obviously some level of discrimination.
If you believe in reincarnation, you should have no trouble with the caste system. I mean at one point you are higher caste and another, you are lower caste.
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Here's something interesting:
Reforms in Hindu Caste System by J. Ajith Kumar
Bhagat ji - This is simply incorrect, factually incorrect. Class is not permanent. It may be difficult to break the class barrier in highly stratified societies, but it happens every day. In the caste system (more accurately the varna system) a person was born and died within the varna. The caste system was instituted with the Law of Manu thousands of years ago. Individuals were born and reborn into the SAME caste until all their karma was washed. Only then did they progress to the next stage.
What happened? Those who broke the caste barrier were punished severely. Read or chant the vedas if you were a Chudra -- and you were punished with death. Happen to walk in the shadow of a Brahmin, and the Brahmin had to take a ritual bath. Both high and low were trapped in a depersonalizing social system that paralyzed society. And it is still going on. A 2-year old Dalit girl gang raped because her father supported a local dera. When he sought justice his arms and one leg were cut off. If you and your betrothed want to marry (you are a Jain or a Sikh or Buddhist) you still have to pay a Brahmin for the ritual of walking around Agni.
So things sound hamrless, irrelevant, or maybe even unimportant in theory -- but in fact a entirely different picture unfolds. Forgive me. I am speaking in a sharp voice. Please dig a little deeper when you make arguments like these.