In the case of Taiwan, for political reasons--Taiwan having just been liberated from Japanese territorial and cultural imperialism--it is understandable that Japanese (the Taiwan equivalent to India's English) was banned. But that does not mean it was equally necessary to ban Taiwanese, a policy which created alienation between state and society.
從政治的角度來看，台灣光復後回歸母國語言、禁絕日語有其必要，但連台語一起禁掉，顯然是做得過頭了。