It is difficult to find any information of Lucifer that does not display him as evil.
There are some fragments that grudgingly admit his intervention ultimately amounted to a better outcome than if he had not inserted himself into the events as they unfolded.
There are some beliefs that he is the twin of Jesus Christ. Or they are one and same.
He's just another angel to me. I like to keep it simple: God, Angels, Man
God encompasses the Holy Trinity
Angels encompass all entities that exist as sentient being with ability to perform actions when and where they choose.
Man encompasses all of humanity, the ensouled and incarnate being.
Clearly, Lucifer is creation of God and it is documented in goaspel that God/Jesus has dominion over angels. It also shows that God will utilize the tool that is best shaped to perform the task. With this thought in mind, I would venture that Lucifer is doing as he is compelled to do by God, either directly or indirectly.