If I could un-invent something, I would un-invent weapons of mass destruction. I would just eliminate them from the earth. I would un-invent mutually assured destruction, the arms race, the nightmare of my childhood during the Cold War.

I remember reading a science fiction series where the premise of war was that the only weapons you could use were those that brought you to arm’s length from your opponent — in other words, swords and spears. With the books, this was to prohibit psychic warfare, but it makes sense to me. Weapons of mass destruction kill thousands, even millions of people while keeping one’s hands clean.
One could argue that this would eliminate all area bombs. I’m fine with that. If it gets rid of assault weapons, even better. I could get rid of all weapons, but I think hunting is a legitimate use of weapons (I am not a vegetarian).
What would war look like if we could get rid of looming threats? I hope it would be shorter. And less lethal.