Democracy is not, about implementing whatever the majority says, nowhere in the world is democracy practiced like that. Democracy is about safeguarding minority rights and enforcing a government which functions by compromise. Protection against the tyranny of the majority, is what democracy is about.
To justify the "Orwellian". A society wide consensus justifies a total state, it removes legitimation from the opposition and creates an environment where divergence becomes suspicious. What OP does not understand is that totalitarian regimes in most case do have a popular mandate and exactly that popular mandate is used to justify the total state. Additionally, OP talks about Iran, but has he considered what would happen if 70% of the Iranian population would support the regime? What would the result look like, if not perfect evidence that the opposition should be oppressed.