I actually am kind of shocked by the supreme court decision. It usually is a highly valued ideal is modern democracies that the state doesn't interfere or prevent the forming, of peaceful law abiding groups who's values it disagrees with. This ruling seems to go against that. With the same logic, they could ban advocacy/lobby groups that advocate the repeal of smoking bans in restaurants and bars.
I think, what should have been done, is to prove just 1 instance this group encourages/abetted/aided someone to commit a criminal act against a child. If the police spent any resources on this I suspect there is examples to find. Then I think they could have brought charges against the organization. Instead, how I take the above is the Court decided to argue the limitation of freedom of speech to Dutch values.
the rhetoric: "the organization should be banned because the protection of children should weigh more heavily than freedom of expression" I think is completely off base because it implies the group is harming children, but then they should have made criminal charges. It seems at one point these were made, but the group was found not culpable of "social disruption" i.e encouraging the breaking of law.
I think the good news, is not so much this ruling, but the change in culture in the last 30 years. I think since the lawsuits against the Church, the Sandusky scandal, the Savile scandal, many people are more likely to see what this group for what it is and to reject the arguments. This group exists in a fantasy world, and I think the public is much more discerning of reality today in this regard. I know in the UK there was similar groups decades ago, but there is hardly tolerance any more for such a group in the public sphere.
If this group in Belgium, did make national attention in 2007, you would think they would have targets on their backs, and I would have thought they would have disbanded already. So, I see perhaps it was a public outcry that pressured the Supreme Court to take the case, and rule the way they did.