The first — and really only — order of business for the government is to solve problems beyond the grasp of a single person or a small community. In exchange for that service, we the people surrender some of our income and liberty. This grand bargain breaks down when the government decides it’s got other things to do besides take care of everything from our sewage to our space debris.
The longer the government falls short of our expectations, the more likely the people will be to opt out of their own obligations, such as voting.