This made me think about other tech that has no good use. Flamethrowers come to mind. Not the fun ones that Elon will sell you as a gimmick, but the ones that t

This made me think about other tech that has no good use. Flamethrowers come to mind. Not the fun ones that Elon will sell you as a gimmick, but the ones that toss sticky flammable liquids at people. I was listening to someone describe their use in WWII, and he was I suppose trying to defend it by saying that actually most of the people it killed weren't burned at all, but rather killed because they were in enclosed fortifications and apparently flamethrowers produce prodigious amounts of carbon monoxide - basically you'd take a couple breaths and it's over - the carbon monoxide will bind into your blood cells such that even if you immediately step out into fresh air, you're a dead man walking. But at least your corpse will be recognizable for your friends and family I suppose; you won't be burned beyond recognition. But building a reliable flamethrower is an interesting technical challenge, so I'm sure you can find an engineer who will be willing to give it a go.