Chemical weapons still exist and are used[1]

So are beanie babies, NFTs and garbage pail kids -- Things that have fallen out of fashion isn't the same thing as eradicating a technology. I think that's part of the difficulty, how could you roll back knowledge without some Khmer Rouge generational trauma?

I think about the original use of steam engines and the industrial revolution -- Steam engines were so inefficient, their use didn't make sense outside of pulling its own fuel out of the ground -- Many people said haha look how silly and inefficient this robot labor is. We can see how that all turned out.[2]

1: https://www.armscontrol.org/factsheets/timeline-syrian-chemi...

2: https://en.wikipedia.org/wiki/Newcomen_atmospheric_engine