There are plenty of things that are unknown, but are assumed reasonably to exist, even in the most basic sciences. Maybe 90 percent of the mass-energy in the universe is called "dark," because nobody knows what it is.
South Africa, with US support, after the fall of the Portuguese empire, invaded Angola and Mozambique to establish their own puppet regime there. They were trying to protect Namibia, to protect apartheid, and nobody did much about it; but the Cubans sent forces, and furthermore they sent black soldiers and they defeated a white mercenary army, which not only rescued Angola but it sent a shock throughout the continent-it was a psychic shock-white mercenaries were purported to be invincible, and a black army defeated them and sent them back fleeing into South Africa.
If something comes along that you don't like, there are a few sort of four-letter words that you can use to push it out of the sphere of discussion. If you were in a bar downtown, they might have different words, but if you're an educated person what you use are complicated words like "conspiracy theory" or "Marxist." It's a way of pushing unpleasant questions off the agenda so that we can continue in our own happy ideology.
Democracy doesn't mean much if people have to confront concentrated systems of economic power as isolated individuals. Democracy means something if people can organize to gain information, to have thoughts for that matter, to make plans, to enter into the political system in some active way, to put forth programs and so on. If organizations of that kind exist, then democracy can exist too. Otherwise it's a matter of pushing a lever every couple of years; it's like having the choice between Coca-Cola and Pepsi-Cola.