The big asterisk in what you're saying is, like self driving cars, it's hardest when you want to be the most precise and limit the downsides. In this paradigm, false positives and false negatives have a very big cost.

If you simply wanted to cause havoc and destruction with no regard for collateral damage then the problem space is much more simple since you only need enough true positives to be effective at your mission.

The ability to code with ai has shown that it requires an even higher level of responsibility and discipline than before in order to get good results without out of control downside. I think the ability to kill with ai would be the same way but even more severe.