&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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Nano-Chainmail 2D Mechanically Interlocked Polymer
'Nemourlon armor of reasonable weight resists penetration by most fragments and any bullet that is not both reasonably heavy and fairly high-velocity.'
Humans Love Helping Other Species
'At the ringside opposite them a table had been removed to make room for a large transparent plastic capsule on wheels.'