Why did they have battle drones?
At the start of the movie, it's stated that nobody is building weapons anymore. War has been eradicated and nobody is building weapons. It says it right at the start of the movie. Why would they need battle drones if they weren't fighting anybody? What was the pointing of ANYTHING they were making at the start of the movie?
Also at the start, it's stated that everyone had to move to that floating city thing because there was no more vegetation on the land, but Astro Boy finds the big robot in the middle of a field. A field. A FIELD.
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