Ok since I live in the same city I can give you some insight.
The wall divides 2 districts and marks the territorial boundaries between them. The bad thing here are the land traffickers. They “sell” spaces on the hills to not-much-so-unsuspecting people. Land trafficking brings gang violence and murders with them. By the way the hills are property of the State, so there’s that.
Now, the ruling helps only these traffickers who will have new land to “sell” and traffic with.
What about the poor people? Once they get there they demand the State to bring water and electricity services, for A land which they don’t really own or made an effort to buy it properly. The State can’t do much because of the social cost and lost votes and has no choice but to please them.
That is why I am sticking to my Citroens and Peugeot.