We don’t. We won’t. 9/11 and Iraq proved this.
And now complete genocide happening on the evening news for all to see. Behead a few American babies and young men will be lining up to kill. Simple math.
Discussion
As long as people like you and me are cognizant of the past, there is always hope. Eventually, enough people will come to the same realisations and things will shift. Especially if we keep talking about it. They have before, they will again.