God created the perfectly-righteous Lucifer, by God's choice. Lucifer created the absolutely-wicked Satan, by Lucifer's choice. Lucifer, and all of the millions of angels had the power of choice - to obey, or to rebel. The angels were not created like mindless machines. Biblical accounts of them show that they are individuals with powers of reason.
Good angels are capable of patience, joy, compassion, curiosity, and sometimes anger.
Angels have personal names e.g. Michael and Gabriel . God did not force the angels to obey Him. The only thing lost when an angel rebels against Him is the angel's own glorious future - a principle of choice that applies as much to humans, as it does to angels. The result of his rebellion against the love and the law of God is that he is now the greatest loser of all eternity. The second-greatest losers of all time are those who, tragically for themselves, repeat the devil's mistake.