Few of the kobolds who live beneath Westcrown venture onto the streets at all.
Those venturesome few who live within the central districts, quickly find all the meat they can easily carry, from the riots, and retreat back into the sewers for a time.
Those venturesome kobolds who live beneath a district across a river, don't find pickings that easily or quickly, when the riots come.
A corpse left on a river-bank is enough to draw their attention.