[ordinary]

People organise neighbourhood watch WhatsApp groups to prevent crime instead of relying on the police to fix things. Within ten years these groups will probably grow into armed and organised right-wing groups.

I have seen the signs for these WhatsApp groups in my own neighbourhood, but I think you're mischaracterizing them. These groups (and the signs that come with them) have existed for decades: "Attentie, buurtpreventie". They're just embracing modern technology. If their formation inevitably lead to armed militias roaming the streets, then we would've seen them by now.

Groups like these crossing the line would be a result of other changes in Dutch society.