You ever asked why?
Have I ever asked why about "what" exactly?
Seriously Satan has to be as intelligent as your average human if not more so. He has to know Revelations and what awaits if he continues to disobey.
Well, considering that Satan thought that he could usurp the position of God, Almighty, Himself, who created him and gave him life -- in the beginning, it raises the question in my mind as to whether Satan does understand that, exactly.
I mean, if he really did understand what awaited him -- if he disobeyed from the beginning, he would have never gone down that track to begin with. But, since he did go down that track to begin with, this indicates to me that Satan apparently thinks he can get away with it, or at least thought he could get away with it back then. Perhaps he still does think he can get away with it.
Intelligence isn't the problem. Sin is the problem and that supersedes intelligence and makes it of no effect. I know that there are criminals who are super-intelligent, but they are still criminals. Intelligence doesn't determine whether one will be a criminal or not and/or whether they will obey or disobey the law. Intelligence actually has nothing to do with it.
If God is willing to give humans a second chance if they accept him I can’t understand why he wouldn’t do so to the fallen angels.
Well, you are mistaken in the fact that humans are given a "second chance". They are not given a second chance. No, not at all.
What has happened is not a "second chance" -- what has happened is that God has "paid the price" for the wrong that has been done, out of the sin nature of human beings. That's not a second chance -- that is "payment for the penalty" of sin.
And from that payment for the penalty of sin, comes the "redemption" (another word for "payment") in which we are given freedom from (1) the penalty of sin (there is still a penalty; it's just that we don't "pay it"), (2) freedom from the power of sin, and lastly (3) freedom from the presence of sin.
God did that with His Son, becoming a human being, in order to pay that penatly of sin for all the human race, in the infinite nature of the "Son of God" in that He is fully human and fully "God", in one being.
That's not a second chance -- that's God "paying the penalty" for you and everyone else who chooses to accept that payment from Jesus, the Messiah of Israel.
Those humans who refuse that payment for the penalty of sin, are forever separated from God, which is the eternal punishment and torment -- by their own choice. God doesn't force the acceptance of His payment for the penalty of sin.
Now..., in answer to the why angels are not given a second chance, remember humans are not given a second chance either. So, there is no second chance for angels or for humans. There is only the payment for the penalty of sin, for humans, because God, the Son, became "human" in order to pay that penalty of sin for all who avail themselves of the payment.
And..., the angels are not human, and thus -- they have no payment for the penalty of their sin. There is no payment, and thus there is no salvation for angels. It doesn't exist.
And going back to Satan and his original sin (because sin originated in Satan, before he passed it on to the human race) -- if you understand what has been said above, then you see immediately, that at the moment that Satan sinned, in the beginning -- he was finished, as there is no redemption for angels and Satan's fate was fixed, permanently.
And why not destroy the Devil rather than torment him forever and ever?
Well, if there is one thing we see from God's word about life -- it is that life is eternal, regardless of the situation of sin. It's either eternal with God or it's eternal without God.
And since God will tolerate no sin in His presence, those with sin will be eternally separated from God. And that is the eternal torment with which those humans, who have refused God's payment for their sin -- will find themselves in, in the future.
Those humans who have availed themselves of that payment for the penalty of sin, will have their salvation complete, as God promises them also -- the freedom from the power of sin, too. And God additionally promises them the freedom from even the presence of sin, altogether. That is the "new birth" in Christ, in that all who have accepted Him, as their Savior, will be "born again" -- which is to be "made new" in Christ, and therefore be free from the (1) penalty of sin, (2) the power of sin and (3) the presence of sin.
There is no destruction of the life that God has given by "His breath of life" (in that He has breathed life into those being). That life that God has given that way -- will never be destroyed. It either lives with Him, in a sin-free existence, or that life lives without God (totally separated from God) in a sinful existence.
And to be eternally living, and in a sinful existence, and never to be with God again, and all that is good (from God) is "eternal damnation and eternal torment" to be sure.
If that doesn't "scare the hell out of you" (literally so...) -- then nothing will and you will probably be one of those eternally damned and in eternal torment, along with those angels who chose to disobey God and also with Satan in his eternal torment, too.
For your sake I hope you are right.