Ansari's remarks come within days of his strongly pitching for affirmative action for Muslims as a prerequisite to ensure a the success of the government’s 'sabka saath sabka vikas' vision.

Delivering the first Ram Manohar Lohia Memorial National Lecture at Gwalior yesterday, Ansari said,"In a democratic society, including ours, the need to accept difference of opinion is an essential ingredient of plurality. In that sense, the right of dissent also becomes the duty of dissent since tactics to suppress dissent tend to diminish the democratic essence."

Speaking about the principle of dissent in democracy that Lohia personified, he said the expression of dissent does play a role in preventing serious mistakes arising out of what has been called 'social cascades' and 'group polarisation' which act as deterrent to free expression of views or sharing of information.

"It has been observed with much justice that the history of progress of mankind is a history of informed dissent," he said, adding dissent as a right has been recognised by the Supreme Court which maintains that restrictions on it have to be reasonable and cannot be arbitrary, excessive or disproportionate.

Earlier this month, Ansari's comments demanding affirmative action for Muslims as a prerequisite for the success of the government’s 'sabka saath sabka vikas' vision had invited criticism by various right-wing outfits.

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