The current period is nearly a perfect mirror with modern trappings of the turmoil right before World War II.
Remember, the weapons were essentially stone age in World War II. Tanks and artillery.
The Third World War is going to be many exponential magnitudes of order greater in civilian casualties. It is likely they will be the primary targets where formerly the second World War was fought "over there" by the military for the 'Stain.
Mankind never learns anything from history. Whenever you think they have learned, you yourself have failed to learn from history. Learning that humans don't learn is one of the most important lessons you can learn.