A recent RTL Nieuwspanel survey shows that 25 percent of Dutch voters have lost confidence in every political party. This distrust is especially strong among those who voted for Nieuw Sociaal Contract (NSC), with 32 percent expressing no trust, as well as voters for BBB (28 percent) and PVV (26 percent).
The most extremist-proof voting system I know of is approval voting. Proportional representation is unfortunately not really great at preventing extremism.
I mean, there’s a limit to how much a voting system can do. Western democracies have more fundamental problems.