Do you vote?

[Beskar]

That's an arbitrary judgement though.

-edit-

Basically "if you don't vote you can't complain" is just one of the things people say because they think people should vote, and it makes a handy reason. Like "cheating doesn't get you anywhere" as a reason not to cheat on tests.

Not really, it is like saying "if you didn't eat your breakfast, then don't complain about others because you are hungry." as in, they actively choose not to do something when they could have easily done it. Therefore, they don't have legitimacy in complaining about others about yourself being hungry as your fault that you are hungry, therefore, there is only yourself to blame.

If you don't vote, it is your fault.