> Freedom to travel is a right in USA.
That doesn't imply (let alone exply) a right to board a plane. This is the same logic used by self-proclaimed "sovereign citizens" to get out of everything from speeding tickets to California's agricultural checkpoints, and said logic falls apart for the exact same reason: you can exercise your freedom to travel on foot.
> If you closely observe the TSA process, they check the ID with the name on boarding pass.
Well yeah, obviously. The whole point of the checkpoint is to establish "you are who you say you are" and "you're authorized to be here", not just one or the other.
> they claim full body imaging can be required yet they do not have that authority in practice. They can't even detain people.
They clearly do and can, as plenty of people have learned the hard way. That, or you can walk (or drive, or bus, or train, or boat, or whatever) to your destination.
Like, I'm with you that TSA is security theater and largely pointless, but you don't have to buy into sovereign-citizen-style misinterpretations of the law in order to arrive at that conclusion.