To get the public to go along with the kind of radical social change that strips people of rights and privileges — and, eventually, their wealth — requires a shock to the political system which can then be exploited by a cynical political leader, his party, and their media allies.
In the second month of his reign, for example, Hitler had his Reichstag Fire, which pushed the German Parliament to pass “emergency” laws expanding his executive power and limiting the reach of parliament and the rights of average people.