Dunno about other European countries. Here, the opinion pages and myriad columns of all the newspapers have been overflowing ever since with all kinds of takes on the issue, from "see, we should have clamped down on all those muslims a lot sooner" to "i wasn't a big fan of his, but when anyone is murdered just for their opinion, it is an outrage" to "this is an outrage, but perhaps also a warning call".
A lot of the trouble is in who van Gogh was ... in this overview
of various columnists' reactions I probably put a grossly unrepresentative focus on what you might call the waverers, but the thing remains that for many this is a, "i dont agree with a word you say but i will defend with my life your right to say it" kind of situation (who was it that famously said that?). So you get a lot of the, "i didnt like what he was saying or how he said it myself, but ...".
Nevertheless, there's plenty of outrage of course. Van Gogh's funeral was attended by many, and there isn't a writer or columnist who hasn't by now expressed his horror and condemnation - including the many writer-columnists of Muslim/minority background. The place where van Gogh was murdered has been a sea of flowers and protest notes and people gathering to discuss what happened. And there was the commemoration/protest march the night of his murder in Amsterdam, of course, and the later smaller demonstration by Muslims in the Hague.
But a lot of the discussion is now sidetracked or doubled over by the new layer of problems that has followed van Gogh's dead. All the arson attacks, the bomb explosion. That has people now talking about the ethnic tensions, about the increasing violence between Dutch and Moroccans, which all really has quite little to do with the actual Jihadist thread and a lot more with the problems that have been simmering for so long. Its not that people dont talk about the murder anymore - another three pages of opinions in today's NRC - but that those two different layers partly overlap and partly represent different problems, taking us into different discussions. Thats why you get such a weird juxtaposition like that of Van Aartsen's and Donner's statements in my post above.