Police in the States are already using robots to deliberately kill 'suspects' ! From last year https://www.google.co.uk/amp/s/amp....ce-bomb-robot-explosive-killed-suspect-dallas
...and Connecticut Police will soon be able to (or might already?) be able to shoot you dead, or blow you up, or burn you to death...with a drone The law will permit their Police to "use drones equipped with tear gas, incendiary and explosive devices and "remote deadly weapons"." https://www.gizmodo.com.au/2017/04/us-cops-just-got-one-step-closer-to-killing-people-by-drone/
Its a bit like the Americans spending millions on developing a pen that would write in space. The Russians in the meantime, used a pencil