&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.
Humanoid Robots Tickle The Ivories
'The massive feet working the pedals, arms and hands flashing and glinting...' - Herbert Goldstone, 1953.
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MIT Computerized Bionic Leg Is Part Of The User
'The leg was to function, in a way, as a servo-mechanism operated by Larry’s brain, through the mediation of the electronic brain in the leg.'