Tim, I put that word “privilege” in there intentionally to stem your very question. Voting is a right granted to us by our government. But in a sense that right is a privilege the government afforded us on the basis of the system of democracy it adheres to. Joining the military or running for office is not a right nor a privilege. I woudl argue.

It is much like we should return a shopping cart to those shopping cart storage areas as a Christian. This is our way to show love to the person whose job it is to gather those carts. There is no law to require us to do so. But again, love reigns. So in the same way we should vote to show respect and submission to a privilege that our government gives to us.