1- please take a simple class in economics. Supply depends on demand, without a demand the supply will dry up, and if there is a demand there will always be people to supply. This is a fact of life and killing people won't change this simple economic law.
Kill off the supply by killing off the suppliers. Trying and executing them. They are murderous scum and need to be dead. I'm not into "understanding" such scum, that's your department.