God wants all to be saved and live!
He wills none to perish from this world that is passing away.
Does anyone want the fate of Satan? I would think not!
So therefore a warning like in the days of Noah's flood.
Long in advance.

" I am he that liveth, and was dead; and, behold, I am alive for evermore, Amen; and have the keys of hell and death."
----- Revelation 1:18

He gave His life for us to save us.
To follow Him. And avoid Satan's fate!