How many years till a robotic fly can release a drop of poison in your mouth while you're sleeping? 30-40?
All instances that I could find were accidents. So far.
You are right that military use is a real and existing problem and thus clearly deserves more actual resources + action
I think the idea of this happening domestically in the US is just terrifying. I know that's a selfish thing because we are essentially doing it to other nations but it seems like more of an inevitability than something to put off before it becomes a problem.