Wiki - The paradox of tolerance states that if a society is tolerant without limit, its ability to be tolerant is eventually ceased or destroyed by the intolerant. Karl Popper described it as the seemingly self-contradictory idea that in order to maintain a tolerant society, the society must retain the right to be intolerant of intolerance.
They were pretty tolerant of Aryans and other who accepted the “social contract”. It was only those who “refused the social contract” that they really had a problem with. But we’ve decided that it’s OK to be intolerant toward those who refuse the contract.