@hector Sure, all actions of any one person in the view of all history may be irrelevant. I just figure that in life I hope to nudge things in the right direction, as a parent, employee, citizen. I figure that voting fits with that, but you can certainly make the argument that voting and all of your life is meaningless and all actions are not worthwhile in the big picture.
@hector Casting a vote only takes a few minutes. I may have spent more time on this thread than I did on the ballot. The last US presidential election was decided by pretty narrow majorities in a few states, and is often decided by turn out : more individuals with one perspective deciding to use their time to vote, so I think it matters because there's a cumulative effect.