@clacke @RichPuchalsky it is indeed scary, but just under 24% of the vote doesn't seem inconsistent with many countries, unfortunately. It should absolutely be a wake up call, and not just in the Netherlands.
However, the OP's point of "multi party systems let the fascists win too" is a great example of misrepresenting how popular fascists actually are and thereby giving them the legitimacy of success, which is often what encourages other parties to start working with them.