It's an equal deflection from the main point that adds very little to the discussion. You could have equally said "The war is an unjustified aggression BUT the

It's an equal deflection from the main point that adds very little to the discussion. You could have equally said "The war is an unjustified aggression BUT the USA has been doing that for a long time too so..." and the message would have been the same. You just phrased it differently.