 When people are segregated from one another for whatever reason, there can be important reasons to limit their freedom of association, to encourage social mixing across class and race lines among other things. When people employ their rights of exclusion and exit too readily, and for reasons that conflict with equal citizenship, a society may need to resort to socially engineering certain forms of association, such as mixing rent-controlled and private housing, and shaping social space to encourage interactions among people of different races, ages and classes. If trust is a necessary feature of democratic life, then the citizenry’s habits and living patterns become an important resource. To generate this resource, a society must attend to the concrete spaces of interaction wherein trust, rather than distrust, is more likely to emerge (Ryan 1998: 322). A community divided into gated communities, racially-segregated suburbs and stigmatized ghettos is ill-equipped to provide space within the wider political association for trust to emerge (Anderson 2010: 34; Allen 2004: 165).