If somebody doesn't vote, then they're basically giving a free pass to the incumbent - which if you're in a Liberal, National or LNP seat is literally making things worse in these respects.
There is more to a political party than their stance on a single issue. If you can't see that then you are a moron. And yes, I did just call you that, outright.
It is technically preferential and sure, it could happen, but none of the independents have, or will ever have enough of a following to win a federal election.
Also, for the record. I don't choose either of the two evils as my number one pick when I vote. I always do choose the party I think is best for this country privacy wise. But sadly, they will never win a federal election.