How about the case where God instructed wars during Old Testament times?

Simple:
The answer lies in the question itself, namely, “God instructed”.

When God commanded wars and executions under the Old Testament Covenant, it is Justice toward the evil which was done by them prior.

God never instructs the killing of “innocent, non-violent” people.

Since we know that God never changes from His Good Principles even in Judgment such as “Eye for an eye” (Old Testament) and “the same measure you judge, it will be measured back to you” (New Testament), both being “equivalent”, thus it is safe to infer that these “people” whom God judged “harshly” during the Old Testament times or the coming Day of Wrath are actually receiving their “same evil intent and deed” which they would have done or had performed toward “their enemies” as well.

Thus it’s just that they receive what their actions and intents merit.

However, it is God Who shows Mercy on whomever He Wills.

Now, under the New Testament Covenant (which is to hold until the end of our current age), such acts of “killing in the name of Justice” have been “nullified” by Christ Who instead, instructed “true believers” to “lay down their lives instead” (true martyrs with “no” resistance at all, for Holy Scripture instructs, “Do not resist an evil person” and in another place, “If one slaps you on the cheek, offer the other cheek also” etc).

So, the modern day perverted Christian zionism for Israel led by the Western world has “nothing” to do with the “Will of God” because “they kill” and Christ instructed Peter to “put back your sword in its sheath” for “those who live by the sword will die by the sword” (either here or in the punishment meted out in the afterlife).

The prophecies in the Bible clearly spell out all these “evil acts” which will be done “against His Will”, for example, “the rebuilding of the Jewish Temple is the agenda of the antichrist/son of perdition” because “God has done away with the Temple since its purposes have been served within the Old Testament Covenant” with the “Death of Christ for the sin of the world” and thus “He doesn’t need any such ritualistic temple acts or offering for sins anymore”.

In fact, it is Lord Jesus (God) Who prophesied the destruction of His Temple meaning it is “never His Will to rebuild a Temple for Jewish ritualistic acts anymore”.

The Devil knowing this has greatly deceived Christendom to become violent and wage wars under the “creating a Jewish state agenda” and later the “need to rebuild the ancient Jewish Temple” in order to “spill more blood” and “blaspheme Jesus’ Holy Name”.

You see, a prophecy in the Bible (written) tells you the “evil done by men led by the devil” when it “contradicts His Word / Principle” such as the “rebuilding of the Temple” which as Scripture testifies, “is never God’s Will” for “He prophesied and Willed its destruction in Lord Jesus Christ”.

Lastly, note that the “original Jewish state” or nation of Israel was formed by a UN charter in “peace” (no war, bloodshed) in the 1940’s proving such a “Way” and act was the “Will of God”.

The subsequent “murders” in the name of defending her territory to enlarging her boundaries has “nothing” to do with the “Will of Christ” simply because it’s not done “according to Christ’s Principles as outlined under the New Testament” but rather has “spilled more blood” (both Israeli and Palestinian blood) – what a Christlike performance by the Christians who have prayed and participated to support such silly “fleshy indulgence of blood”.

Truly, I perceive that the prophecies concerning the end of man will be fully fulfilled by such “murderers” (who have no age-during life abiding in them as Scripture testifies) from both enemy camps who have been “killing in the Name of God”.

Hell awaits all of you murderers for a reunion there.