This may come as a surprise to people, or perhaps not, but even the fallen angels are being deceived by Satan. In fact, they are often far deeper into Satan’s lie than most humans are. Satan has blinded them with a great delusion to make it seem like victory is possible against God. Why else would the fallen angels remain obedient to Satan? How else would have Satan persuaded the angels in Heaven to rebel against God in the first place? These angels were once loyal to God, fulfilling their duties in Heaven. But, evidently, Satan was able to persuade them away from God. No doubt, Satan used lies and deception. Satan likely sowed seeds of doubt in the minds of the angels, convincing them that God was unjust and was abusing His power. Satan would have given the other angels the idea that everything could be so much better if they overthrew God’s government and took rulership over creation for themselves. This was Satan’s entire plan with his rebellion: to overthrow God’s government and to be seated higher than God, having greater power and authority than God.
How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations! For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north: I will ascend above the heights of the clouds; I will be like the most High.
Isaiah 14:12-14
The fallen angels are stuck in the very same occult system they helped create; they are prisoners of their own system, giving their power to Satan through that system (you can even think of fallen angels as being “batteries” of occult power, giving their power to Satan and to his human followers, which is how the occult/witchcraft gets its power). Most likely, even high ranking fallen angels are unaware of the deeper, sick and twisted corruption Satan is doing in secret, which, if the other fallen angels knew, would cause them to abandon Satan; they would say “enough is enough” and abandon this plan altogether.
There will come a time when Satan’s schemes will start to all come tumbling down (at the time when Satan and the fallen angels lose their heavenly seats during the angelic war described in Revelation 12), and in so doing, it will turn out that each and every promise Satan has ever given was a lie, since Satan’s entire kingdom is based on a lie to begin with. As each promise is exposed as a lie, all of Satan’s followers (including the fallen angels) will hate him with violent rage since they all have been deceived; tricked into believing that they would be rewarded by Satan and blinded to the fact that Satan’s entire system is a fraud.