Although created higher than us, angels and many other spirit beings are still not perfect. They also have free will. As a result, they also can make mistakes. Some have even deliberately disobeyed God. One such being is Lucifer.
Lucifer is not an angel. He was a high-ranking administrator of a group of inhabited planets that included ours. Lucifer became impatient with God’s plan of gradually leading beings such as us toward greater enlightenment. He rejected God’s plan and tried to do things his way, trying to speed things up. The end result has been catastrophic on our planet and many others. (Not all inhabited planets are as riddled with sin as ours; in fact, most are not.)
God’s response to such a rebellion? More free will of course. Lucifer was allowed to have his way until angels and others in his part of the universe had chosen whether to follow him or God. He was then taken into custody, along with those who chose to follow him.
It will take a long time to repair the damage done by Lucifer. Fortunately, he is no longer free to create chaos on our world. This means we cannot blame him for our behavior. “The devil made me do it” is no excuse. Each of us is completely responsible for our own actions.
More about Lucifer and the current status of his rebellion can be found in
The Urantia Book.