Yes the American system is based on the admirable but false idea of the intelligent citizen.
It probably worked a lot better when all the voters were wealthy land owners.
This is emotional manipulation and not an argument.
> There are countries significantly more democratic and happy than USA.
Red herring. None of those countries are near the size of the USA. Policies and governance systems are not scale-invariant, and there are many naive ideas that sound good on paper (and may work for small groups of people and/or short timescales) but do not stablely scale to 100 million+ people.