At one of Britain's most symbolically charged border crossings, hundreds of masked demonstrators appeared on a Saturday morning, blocking roads and voicing grievances about immigration before dispersing by midday. The episode left behind not a resolution but a question — one that speaks to a recurring tension in democratic societies between the legitimacy of public anxiety and the capacity of institutions to anticipate where that anxiety will find its expression. Kent Police called it spontaneous; critics called it a failure of foresight. Both may be true, and neither fully settles what the mo