The drug pushers are not the root of the cause, so killing them will not solve the problem.
It is like you are sitting in a boat with a hole and use a cub to throw out the water that leaked in.

And what is more concerning, is that everybody have a right to live, whether you are a drug addict or ordinary man.

I am totally against drugs, because it cause a lot of evil things, but the root is the corruption of the government which leads to poverty and slams, this directly cause financial pressure, or even depression and make the people make choices they would never choose if they are in a healthy envrionment.