1) Looked at Job , Satan claimed he could make Job curse God, shot down on that point. Even the lie he used on Adam and Eve would never sway Job.
2) It provides the Christian with the opportunity to be an overcomer in spiritual conflict. That in turn will make them stronger in the Lord. Jude 20,21 …building up yourselves on your most holy faith, praying in the Holy Spirit. Keeping yourselves in the love of God, looking for the mercy of our Lord Jesus Christ unto eternal life.
3) And the destruction of Satan necessitates the destruction of his kingdom which would end the sinner’s opportunity for salvation. 2 Peter 3:9 The Lord is not slack concerning His promise … but is long-suffering toward us, not willing that any should perish, but that all should come to repentance. So it is up to us to accept the free gift give to all , that cost Him so extremely much that in doing we may live with Him forever , no end !!