Thats because things like congress or a parliament are made, specifically to shield power from democracy, through the pretence of democracy. Its aristocratic rule. Although the same net result as the US, the UK is clearer showing how it works. We had a barrons revolution in 1215 and they've been in charge ever since. We just changed who the barrons are and what makes someone a barron.
Even the ancient greeks had that one figured out centuries ago.
The system is working exaxtly as intended.