It was. The problem Democracy was not designed to address is a completely different one. To trust Democracy, you have to feel you benefit of it. For a long time, living in a democratic country meant improving your standard of living, slowly but steadily. Respect for the current system of government comes from the system of government benefiting you. It's aligned with the Golden Rule: Don't do unto others what you don't want to be done to you. The system of government sets boundaries of things you can do, and you respect them because you don't want the same things happening to you. You respect Democracy, because if the current government does something you don't want, you can always publicly complain, elect different officials or run for office until your grievances are addressed.
Several decades without real improvement of the standard of living for the average citizen has shaken the support for Democracy, because people feel Democracy has failed them. They no longer insists on upholding the rule of Law, because there is the impression that the Law benefits the wrong people. Decades of sentiment, reiterated in countless movies, novels, documentations and opinion pieces, have consolidated to the general view that government officials and politicians are either incompetent, grifters or blocked by countless laws and regulations to do something for you -- and this view is now so ingrained that people don't expect anything anymore from Democracy and are ready to try something else. The U.S. has broken the promise of your pursuit of happiness, and the pundits explain to you it's your fault. Throw out the rule of Law, throw out the balances of power, throw out elections in general when all they apparently do is benefiting the wrong persons.