[JustSayNoToNannies]

Since it is unlikely that any election is decided by a single vote, if one adopts the logic of “only if my single vote is the difference” the resulting conclusion is that my single vote makes no difference

Wrong - the conclusion is that factors other than who wins the election need to be considered ... particularly factors like message-sending that, unlike who wins, are nonbinary. (That is, a message can have degrees of loudness whereas one either wins or doesn't.)

[D-fendr]

Yes, of course. I could strike-out on purpose to send the message I don’t like my coach. My one at-bat likely won’t affect the outcome of the game. Better yet, I’ll just quit the team when I step up to the plate.

But then that would require I ignore the reason for playing at all or that I cared more about sending a message than who wins or loses.

Then, in your plan, your logic would still require you to think your one vote “message” will make any difference in the undefined amount to reach your goal which you haven’t a clue if its possible to reach anyway.

Sorry, your position collapses on the slightest examination using reason.