It seems to me that "anarchy" is a criminal gang going around to transmitter owners and extracting money by force.
WHO would then stop me from broadcasting OVER an Air America station- LOUDER than them? They are mostly on low power signals. I happen to be wealthy. It would be EASY to accomplish.
Two answers: In a small government world (no FCC), homesteaded frequencies could be defended in government courts.
In a truly free market, homesteading rights could be enforced by private arbitration and a reputation rating system.
There is LIMITED space on the dial.
That was the FCC's decision, not the market's.
To use your terminology, from the viewpoint of (me) a 25+ year owner of 4 stations and other broadcst stuff, the FCC is a quite NECESSARY "parasite."
As I said, "some existing broadcasters will balk". Do you feel good when you cut checks to the FCC?