Because this is a tech forum, not a weapons forum. I'd wager that a sizeable chunk of folk decrying AI/LLMs in this manner also do, in fact, decry the same weapons you refer to. They just do it elsewhere because it's not typically on-topic here.
Context is tech, I agree. Is there no tech in weapons? Palantir? Drones? Are there developers that are proud when they made the kill machine 1% more precise; more optimized?
I think the evil part is putting it in the hands of the general public. The ability to create propaganda and deep fakes gives everyone a powerful tool for manipulation. The rich and powerful are going to do whatever the want, anyway. Everyone having access to that same tool doesn't make it any less dangerous.
There's nothing inherently evil about a knife. Standing outside of a high school and handing a knife to every kid walking in is pretty evil though.
This has been possible for pretty much the entire history of humanity. The bar has been lowered, but not by a lot imho.
I don't disagree on the rest, and I didn't say there aren't bad uses, but there are many many good uses for AI/Sora. You can't say the same for weapons.