The term "black market" is used for three reasons:
First, numerous stolen goods are sold here; second, many individuals without identification frequent this place; and third, no record is kept of any business transactions.
Why does such a disruptive black market exist in Ravensmouth City?
Perhaps only those who reap the lion's share of the profits from the black market truly understand why.
For safety reasons, Link chose to visit the black market during broad daylight.
No matter how chaotic the West District is, or how brutal people can be in the Black Market, most would not dare to murder in broad daylight.
As long as Link doesn't act recklessly, things should go smoothly.
The Main Tower and the Municipal Building only tacitly allow the West District to devolve into chaos and the black market to exist; they will not tolerate excessive violence within these areas.