This is because he took some very out of the world decisions and also he didn't stick to any particular decision and kept changing them which caused lots of troubles for thd ppl living in his region. Also he did not have a good idea about his region, so his rules for tax collection, etc made the ppl suffer.
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Tughlaq was called crazy by the historians because he changed his decisions very fast . this caused his people very difficulties . he decided to change his capital and announced people to move to the new capital when the people were moving , he again announced to return back to the previous capital this caused very difficulties for people
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