I don't understand why people keep having children even during horrible times

Like during WWI, WWII, Black Plague, Cambodian genocide, Great Leap Forward, Napoleonic Wars, Crusades, Holodomor, Belgian rule of Congo, Rwandan genocide, Yugoslav Wars, Mongol conquests. I can't understand why anyone would bring children into those awful situations.

Edit: it's on me for forgetting how awful men can be. I feel bad for all the women that had/have to experience that.