Look at line 120. Milton writes that this choir had been singing at the moment of creation. Not bad.

I mention it here because David Hale dragged me into it.

It's not your fault.

Milton actually wrote that it was the duty, not just the right but the duty, of a nation to rise up and dethrone through execution an unjust, though legitimate, king.

Milton wants the reader to know that she's fallen, we are all fallen, and any problem that we have in understanding the theology of heaven and hell is our problem as fallen readers.