Riots may be symptoms of a deeper socio-political malaise: the product of unjust government policy and racist policing. I know from friends I have spoken to who were participants in the 1981 Brixton riots, that riots can engender a great deal of local solidarity against an oppressive State. But I am far from convinced that energy spent doing damage to life, limb and property is likely to prove more productive than properly thought-out and planned non-violent direct action.
More likely the opposite.

"Anarchism Against Riots" (7 August 2011). - Captain Jul's Mission Blog (2011 - 2013)