everyone America calls "enemy combatants"
America will be killing those people with or without robots. We already have ways of wiping all of the enemy combatants off the map if we want to (for example nukes). Military technology is primarily about finding ways to 1) kill fewer of our own soldiers and 2) kill fewer people who aren't enemy combatants.
America will be killing those people with or without robots
Not necessarily. All else equal, the less it costs to wage a war (in money, American lives, and good will), the more more likely leaders are to actually start one.
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