Yeah, I've lived in Australia and the US. The fine isn't big, the attempts at suppressing voter turnout or inconvenience aren't there, and the privacy of the ballot box means that even if you turn up, and put a ballot in the box, no-one's stopping you writing "You all suck" and not casting any preferences.

But at that point you are choosing to explicitly express your non-support of the candidates. That is still more meaningful than simply not showing up IMO