Landmines are actually a great thing to bring up in relation to drones. Landmines, and our use and export of them, bring about shitloads of deaths and maimings every year, almost exclusively of non-combatants. They require no human agency once set and there’s obviously a huge distance emotionally between setting them and them actually going off. Likely, the person setting the mine will never know if someone was killed or maimed by it.