In Britain and the United States, political power is in the hands of the electoral winners only. In the UK, only 42% of the voters can point their fingers to the ones they voted for sitting in a seat. In the USA, that is about 60% of the voters.
In other words, the truth of the voters does not translate into the truths of the representatives.
Actually, the word representatives is a misnomer. It's more like ambassadors, not like representatives because so many voters did not end up getting represented.
In Sweden, the Netherlands, Spain, about 95% to 99% of the voters can point their fingers to the ones they voted for sitting in a seat.
What does that do for power and for truth?
The various parties in Sweden, the Netherlands, and Spain must declare their truths, otherwise the voters will turn their backs on them, move the lying parties into oblivion.
The UK and the USA voters do not have that luxury; they are stuck with the two largest parties to nearly always be in their faces, and the other parties are there just for amusement, not having much power ever at all.
Post-truth is that the voters in the UK and the USA are tired of their backward democracy. They may not want Swedish or Dutch elections for themselves either, but… Germany shows the way toward a good compromise.
Germany does vote in districts, like USA and UK, but then applies the magic wand.
They look at all votes cast, and when the district results are not in line with the proportional outcomes, then they add a few seats to ensure the voters' truths are expressed indeed. The German system does not undermine the voters' power.
With a minimum of 5% before a party can get any seats at all, the tiny parties are excluded, so all parties are indeed larger empowered parties.
New Zealand changed its two party system in 1996, using a modified German voting system instead. First thing that was obvious (other than having more parties in their House)?
A big jump in female representation, about half more than before, in just that first election. New Zealand had also added seats, so it went from 21/100 to 37/120, which is from 21% to 30.8%.
The truth is that the UK and the USA repress the voters' truths. That is why 'post-truth' became a word, but only in the UK and the USA.
In the better democracies, voters can just vote for a 'Trump' candidate directly. As a result, they end up with 'Trump representatives' that are not as obnoxious as the true Trump.
