First past the post is pluralitarian

It is natural in any democratic system to require a majority for a law to stand. In almost all parliaments a majority of the sitting legislators is required for the law to pass. So too with a referendum, we require a majority of the voters to support the proposal for it to pass.

A characteristic of the first-past-the-post system of voting is that a candidate can win without achieving a majority of the votes, merely a plurality. This is a problem because it means that it is no longer safe to vote for a smaller (liberal) party because to do so would be to waste the vote. In a plurality system the only meaningful votes are those cast for candidates with a good chance of success. So this system subsidises the more popular parties to the detriment of the smaller parties.

Given that the people have a right to elect their government it is possible to extrapolate and claim that the people have a right to a proportional (majoritarian) election. If democracy is a right then equally proportional representation is a right. If we assume that to hold office without having held an election is a crime (that totalitarianism is a crime) then first-past-the-post is a crime of the same nature. If not to have any democracy is a crime then equally not to have the most possible amount of democracy is a crime.