Because actually a lot of people might argue that not having this, in the first place, is why our societies are so easily corruptible.
The open society dogma, and I admit this is just a thought experiment, might very much include the fact that, when someones rights are abused, it doesn't just get lost in the noise.
Being able to vote - and address grievances for which I require government support - seems to me to be a way to complete the vote as a proper transaction, between the individual and the state.
Right now, you vote and get nothing back - well, you get the assumption that your government is still going to be, relative to the last one, livable (or else you'd be a refugee and potentially pursuing statelessness..) - but when you use your Vote Statement as a way of communicating something public - per your own free will and agency (and thus right) - this is also a responsibility that must be addressed by the next administration .. giving your vote even more relevance to the incumbents and challengers, alike ..