As Satanists we delve into the Dark side of our personality and the nature of reality. I believe this is healthy, leads to enlightenment, and builds a powerful personality with real impact in the world.
So for example, I might feel like killing my teacher, but is it OK to actually kill her?
This is a more thorny issue.
I will not say what is right or wrong in any particular situation, that is for you. However as a Satanist, you must take responsibility for your actions, and this includes the consequences of your actions.
In my experience, when I have acted out my hate, rage or envy, the consequences have bounced back negatively on me.
Satan cannot, and will not, protect you from yourself!
But there is a broader, and equally important point to make here.
If you think Satan has your best interests at heart, you are mistaken.
If you do not respect yourself, Satan will not respect you.
Satan should never be used to behave in ways you would otherwise believe to be wrong, and if you do, more than likely, it is you that will suffer.