Without doing any homework it should be obvious that the blowback revenge by people who had children parents spouses and friends murdered by one or multiple insurgent groups will carry those wounds for many generations to come.

There are examples like the Tutsies and Hutus of healing national or religious war wounds in one generation but I do not know this to have happened in The United States or the middle east.

Not even the confederacy seems to have buried the hatchet after 4 generations.

Will it take 2 centuries or more for middle east civility?
Or is this too an unreasonable question.