The Democracy of the founding fathers was Greek Democracy, predicated upon a slave society, and restricted to only the elite. This is the society we live in today, even with our reforms towards direct representation. The system is inherently biased towards the election of elites and against the representation of the masses. Hamilton called it “faction” when the working class got together and demanded better conditions, and mechanisms were built in (which still exist to this day) that serve to ensure the continued dominance of the elite over the masses. The suffering of the many is intentional. The opulence of the wealthy is also. This is the intended outcome.
It's been around for four centuries as the dominant form of resource allocation and is thus also responsible for most of the western world's relatively high standard of living, and increasingly the rest of the world.
Im not defending it whole hog, but it's absurd to not be able to understand it's appeal.
Capitalism was an important development in humankind that indeed increased the productive capacity of the world in many meaningful and positive ways. It has outlived its usefulness though, and now serves to prevent the kind of meaningful change needed to tackle 21st century problems.