What is the point of voting at all if you’re not going to vote for either of the two people who actually has a chance of winning?

No one knows who you vote for. At best, it’s a pointless personal moral victory that no one else will be aware of. You can literally stay home and just tell people you voted for someone and they won’t be any the wiser.

So why bother? To fractionally increase the vast margin your candidate is still going to lose by?