Working backwards from the answer Satanists in the music and entertainment industries believe that a person who rebels against God and commits himself to worldly goals - forsaking everything that God has taught us and doing the opposite - will automatically succeed.
It is as if Satan is the god of this world and his ways succeed on earth. And it can often seem that way.
They believe that everyone is in Satan's power.
This, however, is not the case.
Satan does not exist in reality.
So we cannot be in his power.
Nor can they sell their souls to him.
Nor can he reward them for their deeds.
So practicing Satanism - principles of hatred, violence, revenge, torture etc.. - is pointless.
They are creating great suffering for no reason.
For despite the fact that Satan does not exist their deeds still affect us - negative input, hatred, violence (physical, emotional, spiritual), malice, sabotage, drugs, divorce.....all these things they do while disguising themselves as good.
Most people believe that they are good because they take everything at face value and the Satanists are very careful how they manipulate their image.
This is backwards and forwards.
Backwards (magic) to create success - money and sex etc..
Forwards to cover it up.
But they are evil by choice.
And if they can be exposed - i.e. break the spell that hides their activities - then people will see them for what they are - evil.
And it is not just heavy metal either - it is all rock music and more: sport , movies, novels etc..
A constant diet of evil and sabotage designed to lead you astray and lead you to death and damnation.
But this will not happen.
Death is a theological fiction.
Damnation is a human construct.
Their ultimate purpose is to get everyone worshiping Satan.
They want us to hate God; be bad; live for sex and pleasure; court money, possessions, and status; desecrate the holy; destroy the Church.....
And they think it creates success?