We have had enough of the system. But it's a big country. You can't just walk down the street to the White House to end up getting curb stomped by militarized police. While your family at home starves because you stopped working for a day.

Also with voting, one party is sending a fascist religious cult. If one person tries to do a third party vote, that takes away a vote from the other main party that has the highest odds of winning. It would have to be everyone is doing it all at the same time. But it would be much more likely that the fascist wins while everyone realigns. Do you really want to take that chance?