Given the system you’re voting under - you should vote for someone who has a chance of winning.
The problem is that who ‘has a chance of winning’ is decided by who people vote for.
Voting for a third party with single-digit support is not much better.
Uh, that’s what the Sri Lankan voters just did? The winner this time had 3% of the vote-share in the last election.
Or they were the people who made this year’s result possible.
Yes, but you show that so-and-so’s platform has x amount of support, putting them in a better position next time around.
It’s incredible how one can see some piece of evidence that contradicts their pet theory with their own eyes and say, no, the reality is wrong and my theory is right. I mean, it makes sense sometimes - the discovery of Neptune is a famous example - but in general, it is better to adjust theory to fit the facts, rather than the other way around.