What he says, boils down to a call for an ethnic cleansing of Europe. Listen to his statements here:
In short: There are too many people from Muslim descent in Europe and they have more children than others. Muslims have been contaminated with "a criminal ideology" (Islam). That is why there are so many criminals among them. They have to be sent away immediately. But that is not enough: Anybody who starts "thinking about Sharia and Jihad" or "Caliphate" should be deported too.
"Muslims want to take over our culture" and "change it fundamentally". That is why we have to start deportations to the countries of origin (of their parents).
Like every ethnic cleanser, Wilders adopts a salami tactic: First isolate a part of the ethnic group and earmark them (and their families) for harsher treatment than foreseen in the Law. And in the Denmark interview, Wilders is already targeting a second, larger category: "those who THINK about jihad and sharia". For Muslims, there is not only no freedom of expression any more, but even no more freedom of thinking. Logical conclusion: As you cannot know what a person thinks, every Muslim (or person from Muslim descent) is a potential danger. That is why he is ranting about "tens of millions" of people to be deported from Europe.
Wilders is no more your daily oddball. He has a large constituency in Holland. And more and more admirers in the US, in Israel and in European countries. He has to be taken seriously. Like we should have done, for instance, with that oddball poet Karadzic around the year 1990, when he prepared the ethnic cleansing and mass murder of non-serbian Bosniaks.
The UN The Hague Inernational Court is at this very moment constructing its case against Karadzic, digging into his agitation from before the Yugoslav Civil War.
If we prefer to avoid ethnic cleansing operations in the future, it is there, in the new International Court, where Wilders belongs.
Who has the guts to indict him?