&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.
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A System To Defeat AI Face Recognition
'...points and patches of light... sliding all over their faces in a programmed manner that had been designed to foil facial recognition systems.'
Smart TVs Are Listening!
'You had to live -- did live, from habit that became instinct -- in the assumption that every sound you made was overheard...'