If God requires violence to get rid of the problem he could have eliminated Satan at the outset.
Then that would have interfered with GOD's plan of salvation in this current slice of eternity, unlike the previous slice of eternity, where and when HE destroyed both heaven AND earth age!
Jeremiah 4:19-eoc(end of chapter)
My bowels, my bowels! I am pained at my very heart; my heart maketh a noise in me; I cannot hold my peace, because thou hast heard, O my soul, the sound of the trumpet, the alarm of war.
20 Destruction upon destruction is cried; for the whole land is spoiled: suddenly are my tents spoiled, and my curtains in a moment.
21 How long shall I see the standard, and hear the sound of the trumpet?
22 For my people is foolish, they have not known me; they are sottish children, and they have none understanding: they are wise to do evil, but to do good they have no knowledge. (Jeramiah seeing the END of the Previous earth and heaven age)
23 I beheld the earth, and, lo, it was without form, and void; and the heavens, and they had no light.
24 I beheld the mountains, and, lo, they trembled, and all the hills moved lightly.
25 I beheld, and, lo, there was no man, and all the birds of the heavens were fled.
26 I beheld, and, lo, the fruitful place was a wilderness, and all the cities thereof were broken down at the presence of the Lord, and by his fierce anger.
27 For thus hath the Lord said, The whole land shall be desolate; yet will I not make a full end.
28 For this shall the earth mourn, and the heavens above be black; because I have spoken it, I have purposed it, and will not repent, neither will I turn back from it.
29 The whole city shall flee for the noise of the horsemen and bowmen; they shall go into thickets, and climb up upon the rocks: every city shall be forsaken, and not a man dwell therein.
30 And when thou art spoiled, what wilt thou do? Though thou clothest thyself with crimson, though thou deckest thee with ornaments of gold, though thou rentest thy face with painting, in vain shalt thou make thyself fair; thy lovers will despise thee, they will seek thy life.
31 For I have heard a voice as of a woman in travail, and the anguish as of her that bringeth forth her first child, the voice of the daughter of Zion, that bewaileth herself, that spreadeth her hands, saying, Woe is me now! for my soul is wearied because of murderers.
One may well consider this slice of eternity as "plan-B."
And there is a "plan-C, a plan-D."
Then? The White Throne Judgement!
After which we who are still around shall see what else HE wishes for HIS own good pleasure.