1) Misidentification. When selecting a target, will autonomous weapons be able to distinguish between hostile soldiers and 12-year-olds playing with toy guns?
2) Low-end proliferation. Market pressures could result in the creation and widespread sale of what can be thought of as the autonomous weapon equivalent of the Kalashnikov assault rifle: killer robots that are cheap, effective and almost impossible to contain as they circulate around the globe.
3) High-end proliferation. High-end autonomous weapons are likely to lead to more frequent wars because they will decrease two of the primary forces that have historically prevented and shortened wars: concern for civilians abroad and concern for one's own soldiers.
4) Undermining the laws of war. How can autonomous weapons be held accountable? Who is to blame for a robot that commits war crimes? Who would be put on trial? The weapon? The soldier? The soldier's commanders? The corporation that made the weapon? (from https://www.commondreams.org/views/2021/12/30/humanitys-fina...)
[1]https://www.npr.org/2021/06/01/1002196245/a-u-n-report-sugge...