The work tries to draw an analogy to a person whose legs are bound by birth but learnt to walk, who might mistakenly attribute his ability to walk to the paralyzing binds to his ability to walk and thus be afraid of getting rid of them.
However, the default in our world is having a government. We moved on from anarchy because this was more stable. Prosthetic feet is more accurate as an analogy and one would be wise not to discard them just to see what the world would be like without them.