If the government is requiring the property owner to submit to TSA, that's a public act and not a private one, which means it is bound by the bill of rights and most importantly the 4th 5th and maybe even 6th amendment. The government cannot punish you for exercising your rights by refusing you to move forward into the private place you could otherwise lawfully go. If you can't go to the employee area, that's because certain individuals are trespassed from going there from the private owner, not because the government is forcing it. If you can't go to the boarding area, because of the TSA by public act strong arming the property owner, that is not an act of the private owner, and if it's done because you refuse to answer questions it is a violation of your rights.
The ruse here is to pretend like the property owner is agreeing with TSA because TSA forced them to this agreement by government act. But that is just the government trying to have their cake and eat it by forcing someone to do something and then pretending it is a private act which isn't bound to the constitutional right to not have to answer additional questions.
Just wait until you find out how the feds enacted the 55mph speed limit or are using the threat of revoking Medicare funding for hospitals that perform certain medical procedures that the feds would like to have not happen...
What are you talking about?
The government can absolutely pass laws prohibiting you from entering a privately owned location. There is no constitutional right of access to private property.
And more specifically, the commerce clause of the constitution allows the government to regulate air travel, which means regulating airports. The fact that they're privately owned doesn't change anything. If a private airport owner allowed you to proceed through security, they'd be breaking the law.
There's no public access doctrine for airports the way there is for streets or parks.
You clear seem to wish it was otherwise. But it's easy to do the research to understand where the authority comes from and why it's entirely constitutional.