I would most likely agree with the second interpretation, it's in the Three Metaphors section, and while your first thought had some good metaphorical thinking, the second is a metaphor in the sense of the entire song.
Also, the line "I didn't do it, so you'll let me leave won't you?" in the beginning is chilling when you consider that there are still people being held without trial and without knowing what they're being held for.
I would most likely agree with the second interpretation, it's in the Three Metaphors section, and while your first thought had some good metaphorical thinking, the second is a metaphor in the sense of the entire song.
Also, the line "I didn't do it, so you'll let me leave won't you?" in the beginning is chilling when you consider that there are still people being held without trial and without knowing what they're being held for.