Because it matters more than you can ever imagine, because no matter where you are it's the only valid form of expressing your opinion, voting gives you choices, casting your vote is a right, a duty and also a privilege (too many people have fought and died for giving you this opportunity), if you ever want anything to change, if you want to be heard instead of complaining of how your country is not what you want it to be, do something!
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A real entry soon ;)