AMSTERDAM - For centuries the Netherlands has been considered the world's most tolerant and liberal nation. This attitude is a byproduct of a disciplined civic society, confident enough to provide space for those with different ideas. It produced the country in which Descartes found refuge, a center of freedom of thought and of a free press in Europe. That Netherlands no longer exists. The murder of Theo van Gogh last year and the assassination of Pim Fortuyn in 2002 marked the end of the Holland of Erasmus and Spinoza. Their killings showed the cumulative effect of two forces that have...