Great art. Shitty story. The author missed the key point of writing about gun-toting robots: there is no reason for their motivations to be identical to those of humans. I don't even think there were any human characters in this story, which is bizarre because there's something like 8 million robots and 311 million beings in the US--proportionally, even in New York, there would be more humans than robots.
And there's no reason to give a crap because these robots aren't even distinctly robots except for their shiny heads. Why even bother? It's a tepid story if you read them as humans, and the fact of them being robots means apparently nothing to the author. Waste of a concept.