If 30% of the population do not feel represented for similar reasons, maybe they should start their own party, after all it should get around 30% of the votes.
Of course this does not work in the USA with FPTP since it would get hardly any votes there because the election system is horrible and encourages the two-party system. It seems Australia even switched away from FPTP, still ended up with a de-facto two-party system but that is okay as long as small parties get more representation than none. Plus, if the people vote for only two parties out of habit and not because the system promotes it, they get what they deserve even if it's bad (I'm not saying that it is).
Compulsory voting may increase the power of the two largest parties since people who only vote to avoid the fee will most likely vote for either of them. Be it because they're the most prominent and their programs well-known or because keeping the status quo may appeal to apathetic voters. You could say it props up an unrepresentative system, but only if and because largew parts of the population do not care. And if they do not really care then either they are okay with the existing structures or it's their own fault that they end up with a bad government and have no reason to complain.
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