I'm not defending autoritarianism or communism, but I think you're just not putting yourself in their shoes and looking at things from their POV. They supress other viewpoints not because they're afraid to be shown wrong, but because they believe it's best to supress them and not have people confused by enemy missinformation.
(Not an expert, but this is my impression from talking to both chinese and vietnamese people who defend or at least don't oppose their communist governments, and also spanish autoritarians who defend the Francoist regime. I used to think they were brainwashed/dumb/evil, and now I think their worldview makes a bit of sense, even if it's still misguided.)
To the extent that party elite started building their own, parallel universe of food, summer camps for kids, apartments, shops, etc. closed to the ordinary people. It was clear to many people that the Soviet road, as followed, goes to a variant of a North Korea lifestyle.