As we seek to serve our Lord Jesus Christ in the world, satanists seek to serve their master. We seek souls. They do too. We seek to free captives. They seek to captivate and bring souls under bondage.
Drugs can be 'useful' operations.
Also grab lots of money. The mafia and others who help supply the drugs think they are getting power, but actually a power is using them. But drugs aren't the answer. They aren't a satisfactory alternative. I hope my response to your question proves useful.