The truth is American "democracy" does "work", but not for the reasons, nor the people, you surely think it does (hint: it isn't you, nor the benefit of society)..
We'll never said their democracy works it's just theirs was the first alternative to govern a nation that the status quo of monarchies since Roman empire fell. Fuck American democracy is clearly not the democracy I wish to one day have, but it did provide stability in leadership relative to monarchies since the leaders (in theory) are chosen by a supportive people for their ability to lead and not because someone fucked had a kid with their cousin and now that kid is destined to lead.
There are many government systems out there, unfortunately some are bad, some are good but I do not know of a one size fits all.