&clipidIf you haven't seen it, listen for a minute to Mythbuster's Adam Savage on the subject of giving a robot a weapon.
(Adam Savage discusses weaponized robotics)
Science fiction writers also seem to come down on the same side, as far as armed robots are concerned; Philip K. Dick's claws (from Second Variety 1953) and the ED-209 (from Robocop 1987) are just two examples.
Of course, the other point of view has been presented. Consider the intelligent and virtuous Bolo tanks from Keith Laumer's works.
Robot Janitors Get To Work
'A few mechanical cleaning devices crept here and there...'- Philip K. Dick, 1957.
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Should AIs and AI Robots Demand Rights?
'This robot is a creature... It is a manlike being. Therefore, like any other talking, thinking man, he is entitled to a court trial!'