SWA wasn't screwed by the government ... they were protected. That's the only legitimate analysis for their beginning at DAL. Wright got involved and THAT resulted in the "adjacent State" requirement ... but that was years after SWA began operations at DAL which shouldn't have.
Wright got involved when the other carriers started squawking about having lost revenue in Dallas ... due to this little carrier's expanding operations ... that they should have been required to field at DFW from the beginning.
You do know that the City of Dallas did try to oust SWA from Love Field, right? A federal judge ruled (correctly) that they had no basis for doing so. Since he had American Airlines' balls firmly and deeply entrenched in his mouth, Jim Wright decided to use the power of government to keep SWA from competing with his puppetmaster without moving to DFW even though they never agreed to do so.