You legitimize the system of control that you say you don't like,
Such is your claim. Now substantiate it.
That's what I did...
If a group calling itself the mafia told you that you have to choose one gang or another and they held "elections", would you feel that by participating in their sham you are somehow contributing to positive change, just a little bit? The act of participating is what creates the illusion of legitimacy.
It is not very common however there are people who are not affiliated with either political parties elected to public office and once elected, a member of public office do not always need to vote on party lines