The gangs of Ashmelion followed a very simple and crude way of life.
For them, humans decided right and wrong not according to legal standards but according to their own subjective morality.
As long as you were strong enough, anything you did was an act of the law.
To most gang members of the Quads, the criteria for whether they should deal with a person wasn't whether or not they had the right to do so but whether or not they felt like that person deserved to die.
That judgment of being deserving of death was naturally defined by themselves based on publicly accepted ceremonial etiquette among the gangs of Ashmelion.
This was a universally accepted fact in the entire city and even if you didn't want to accept it. What could you do? An ordinary citizen wouldn't dare to change the status quo but it didn't mean that they weren't unresigned.
Of course, they had their grievances.
These gangs were just too domineering.