Twenty-five years on from the September 11 attacks, the BBC’s security correspondent writes that the events have come to define a generation of foreign, security and intelligence policy, and that the lessons are still being learnt.
A generation defined by 9/11
For many people working in foreign policy, security, and intelligence, the attacks of 11 September 2001 are not simply a historical event. They are a reference point. The BBC’s security correspondent makes the case that the attacks have shaped an entire generation’s approach to those fields, influencing how threats are understood, how intelligence is gathered and shared, and how governments think about the boundaries between security and civil liberty.
That is a substantial claim, and it is one that is easy enough to understand in broad terms. The years after 9/11 saw major changes in the way states organised themselves against terrorism, how they cooperated with one another, and how they debated the proper limits of surveillance and security measures at home. Those changes did not happen all at once, and they were never uncontested, but they were real and they lasted.
A quarter of a century on, the people who were early in their careers at the time are now senior figures. The institutions they work in were, in many cases, reshaped by the post-9/11 era. That is what makes the argument about a generation defined by those attacks plausible: it is not just about the immediate aftermath, but about the long shadow cast over careers, institutions, and assumptions.
The intelligence dimension
Intelligence work is one of the areas where the post-9/11 shift was most visible. The attacks prompted a hard look at how information was collected, analysed, and passed between agencies and between countries. The argument, in the years that followed, was that the failure had not necessarily been a lack of information but a failure to connect it in time.
That diagnosis had consequences. It drove investment in capability, changes in organisation, and a renewed emphasis on partnership between intelligence services across borders. It also raised persistent questions about oversight, accountability, and the risk that measures introduced in response to a crisis could outstay their original purpose.
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The BBC piece frames these as lessons that are still being processed. That is a reasonable way to put it. Security and intelligence policy tends to evolve in response to events, and the events of 11 September 2001 were as significant as any in modern memory. The question is never whether the lessons were learnt, but which ones, how fully, and at what cost.
What has changed and what has not
It is possible to draw a line between the world before 9/11 and the world after it, but that does not mean everything changed at once, or that the changes were all in one direction. Some of the shifts were institutional and incremental. Others were more dramatic, affecting laws, capabilities, and the public debate about what a democratic state should be permitted to do in the name of security.
What has not changed is the basic fact that intelligence and security policy are perennially being adjusted in the light of experience. The article’s point that the lessons are still being learnt reflects that. Each generation of policymakers inherits a set of institutions and assumptions, and each major event forces a re-examination of both.
For the United Kingdom, as for the United States and other allies, 9/11 was a moment that accelerated changes already underway and introduced new ones. The precise balance between security and liberty has been contested ever since, and that contest is part of what makes the legacy of those attacks still relevant a quarter of a century later.
Why it matters
This matters because it goes to the shape of modern statecraft. The way governments think about security, intelligence, and foreign policy today is not detached from what happened in 2001. To understand contemporary debates about surveillance, about counter-terrorism, or about international intelligence cooperation, it helps to understand the shift that 9/11 set in motion.
It also matters as a reminder that major events do not simply pass. They become part of the framework through which later events are interpreted. The 9/11 attacks are now a quarter of a century in the past, but they continue to inform how a generation of officials and analysts think about threat, risk, and response.
What happens next
The longer view of events like 9/11 tends to sharpen with time. As the immediate memory fades, analysts and historians are better placed to assess what changed and what did not, which responses were proportionate and which were not, and how the institutions created or expanded after 2001 have evolved.
For now, the BBC’s piece is a contribution to that ongoing assessment. It frames 9/11 not only as an event to be commemorated but as a turning point whose implications are still being worked through in the fields of foreign, security, and intelligence policy.
Source: BBC News.
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