Reaction: England outlawed spring guns a hair under 2 centuries ago. The Chinese were using explosive artillery shells in the 13th century, and naval mines a few centuries later. Why can't the law just say "we don't give a crap about the supposed autonomy or indirection of your clever-but-lethal gadgets, your legal situation will be the same as if you'd tried to stab people with a dagger in your hand." And maybe provide a shiny AI electric chair for the most weasel-worded of the offenders.