Public health is defined by the UK’s Faculty of Public Health as ‘The science and art of promoting and protecting health and well being, preventing ill health and prolonging life through the organised efforts of society’.

This definition locates the causes of ill health and the remedies in the realms of personal and societal agency, and not only in the remit of health practitioners. Although the latter have a role as members of society to make prevention a reality for themselves, families and communities, they play a special part in preventing further ill health for people who suffer mental illness and are seeking help for it.

Other chapters in this book attend to the relational and social fabric that enables people to flourish; it is made of good and trusting relationships, and material conditions that permit thought about purpose and meaning beyond survival.

This chapter pulls together key matters in this book. Its title is a quote from a line given to one of the characters in Hamlet by Shakespeare. That sentence perfectly outlines the intention of Section 5 of this book and the function of this final chapter in which I endeavour to align theory, research and the practical impacts of the topics covered by this book with the circumstances in which we find health services as we near the close of the second decade of the twenty-first century. But, first, I return to Chapter 1, to recapture some of those circumstances. Then, I look at the matters on which I think we should focus in order to sustain healthcare services and incorporate the social agenda identified in this book.

This book’s roots are in an impactful seminar series hosted by the Royal College of Psychiatrists in which practitioners and scientists from a wide array of disciplines came together in 2014 to explore the social influences on our health and recovery from ill health. This volume echoes the evocative conversations in that College and is intended to rehearse research of potentially great impact. It presents practitioners, researchers, policymakers and students of a wide array of disciplines and roles with the material to support them in better harnessing what we now know about the impact of social factors on health. Thereby, the editors hope to influence how practitioners and the responsible authorities work together with members of the public and communities to design and deliver services. Our aspiration is to contribute to creating better-targeted approaches to promoting health and mental health and more effective and integrated interventions for people who have health problems or disorders.

Terrorism is attracting a great deal of attention in the national and international media, and is now becoming the subject of scientific discourse in a number of academic and practice disciplines. Formerly, most studies were undertaken on convicted terrorists, under some level of secrecy, for fear that public disclosure might compromise counter-terrorism efforts; the data might be seen as sensitive or restricted to a small number of actors. This makes it difficult for the public to appreciate the reasoning for public measures that aim to prevent radicalisation and terrorism.

Media reporting of many recent incidents focuses largely on religious rhetoric that is expressed in order to justify political aspirations, including establishing a new state, challenging perceived discrimination and international foreign policies, which are seen to attack or target particular religious groups or communities.

Public health is defined by the UK’s Faculty of Public Health as ‘The science and art of promoting and protecting health and well being, preventing ill health and prolonging life through the organised efforts of society’.

This definition locates the causes of ill health and the remedies in the realms of personal and societal agency, and not only in the remit of health practitioners. Although the latter have a role as members of society to make prevention a reality for themselves, families and communities, they play a special part in preventing further ill health for people who suffer mental illness and are seeking help for it.

Other chapters in this book attend to the relational and social fabric that enables people to flourish; it is made of good and trusting relationships, and material conditions that permit thought about purpose and meaning beyond survival.

This chapter does two things. First, it shows how social identity principles can explain the basic psychological and behavioural effects of crowd membership. Second, it describes some recent research and applied work that shows how these basic effects operate to contribute to harmonious outcomes in potentially dangerous crowd events.

We begin by explaining some of the fundamental psychology of crowd membership in the next section.

The purpose of this chapter is to serve as a bridge between the chapters in the previous three sections and those in this fourth section. Thus far, we have sought to analyse the social bases of mental and physical wellbeing. Now, we turn to the question of how the fruits of these analyses can be applied in practice. That is, we have been reporting and interpreting the way the world impacts individual people for long enough; it is time to consider how we might change the world in order to improve our wellbeing.