Why exactly is Satan bad?
Why is he "the enemy"?
He disbelieved in the only way to know God and disconnected from God and made an idol of himself instead. He sees the order of the universe and it's God as an evil Jinn or misguided Jinn and has deceived himself and others that he is a hero. Self-pride grew into envy, grew into deception, and has caused humanity and Jinn problems.
It can be even be potentially said, the initial arrogance on Angels came from him, and if it weren't for him, perhaps even creating humans would not be a thing.
He was an unexpected yet known possible anomaly. Perhaps no animals, no humans, no material realm, instead just all of us as Angels worshiping God sincerely would be the universe if it weren't for that fool.
We are in back up of back up plans of God (layers deep of back up plans). The initial plans of God (the higher you go to initial plans) are always better.
He tells himself he is here to free us, it gives him meaning, but deep inside, he just wants us to go hell with him. But no one can live with knowledge of that evil, so he is like all other evil creatures "alas they are the mischief makes, but they do not perceive".