Quote:You yourself said that voting was irrational.
So? Are you suggesting we should make it even more irrational?
Quote:Just knowing that your compulsory 5th preference contributed to one of the unwanted parties scraping through and winning a seat is not a good feeling.
Only because you misunderstand the system. It is the reality of the situation that matters, not the fact that people feel bad because they mistakenly think the system has wronged them. Your compulsory 5th preference could have only made the outcome more to your liking. It could not possibly have made it worse. It could not possibly have caused your preferred candidates to lose.
Quote:The outcome can be better from a personal point of view knowing that he did not contribute to the win
Again you misunderstand. If he did contribute, then the outcome is better from his perspective, not worse.
Quote:but in the meantime indicated that there was a significant groundswell of support for a minor party
He would have indicated that either way. Failing to indicate a preference does not change the indication of minor party support. That's the whole point of preferential voting.
Quote:From the hypothetical voter's viewpoint, it's a contribution he would rather not have made.
That is not possible. Any contribution you make will always be better than not making that contribution.
Like I said, rather than speaking in broad generalisations, try to give a specific example of how the outcome can be better than if the voter ranks all candidates. I guarantee you will not be able to do this.
In fact it's the same argument for and against not voting at all. You cannot possibly improve the outcome by not voting, you can only make it better, even if you still don't get exactly what you want. It may appear that because it involves ranking rather than 'voting 1' that it is a different issue, but the issue is in fact exactly the same. You just have to realise that it is a number of elections, not just one. You still only ever vote for your favourite of the candidates in each election.
http://www.ozpolitic.com/electoral-reform/optional-preferential-voting.html