> Just out of curiosity though why do people not want smart AI weapons?

Because the minute you defer decision making to a machine you eliminate human accountability.

Any time the robot is used to do something illegal or immoral, you can just say "it was a bug" or "that's not what I really meant". It enables plausible deniability.

We see this every time AI is allowed to make decisions. That robot promoted violent extremism in your feed? It misidentified a black man? It disproportionately chose men in hiring decisions? shrug Its the algorithm. Who can argue with the algorithm?

Likewise any attempt to codify liability is typically avoided at all costs because the purpose of those systems is what they do.