I never said democracy was a good idea. I just pointed out that without it you have usually get tyranny. And that (from a societal point of view) is worse. But throw in Capitalism and that ususally becomes guaranteed. Name a large high value corporation that isn't tyrannical.
True, there probably are few to none. However the tried alternatives have been worse (see the Soviet union or East Germany). I don't know if there is a solution that's actually good. Some think that in a perfectly free market, corporations wouldn't grow to such sizes, but I doubt that's correct.