Racial tension, inadequate housing, unemployment, poverty and change will lead to riots.

Inner-city residents of Newark and Detroit : Rioters
In 1967, seemingly isolated events of police brutality against black citizens led to widespread rioting. The underlying factors which contributed to the urban unrest were social and political exclusion of the black population, inadequate housing, unemployment and the urban renewal initiatives which were rapidly excluding citizens for the sake of "cleaning up" the city.
As architectural historian Wouter Vanstiphout points out, the architecture itself is the physical embodiment of larger top-down imposition of government and planning. These power structures, disconnected from the residents themselves, can perpetuate inequality and alienation and sometimes lead to an outburst from the citizens who feel victimized, as it did Detroit and Newark in the 1960-70s, Los Angeles in the 1990s, and Paris and London in the early 2000s.