2019 Polity - Historical Injustice and its repair

What is the main idea that we can infer from the passage?

Untouchability in India has not been taken seriously by political theorists.
Historical injustice is inevitable in any society and is always beyond repair.
Social discrimination and deprivation have their roots in bad economies.
It is difficult, if not impossible, to repair every manifestation of historical injustice.

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