What prevents him from crossing any U.S. state line he d@mn well pleases by automobile, train, motorcycle, boat, horse, foot or pogo stick without showing identification?
You do not have a Constitutional right to travel by air without showing that you are not an individual who may intend to kill every individual on your flight and maybe thousands more on the ground.
Is that what is says on the ID? Are terrorist sleepers screened from getting IDs? I'll say it again, if the government has a list of bad people, it needs to go arrest them now, not wait for them to show up at the airport or drive into the city with a car bomb and happen to hit a "drunk driving" checkpoint.
Read the article. He is willing to show identification, he just wants to see the law requiring it first. There is something wrong with having to obey secret laws, that is why the US Constitution calls for Public Trials.
You don't have the Constitutional right to get married, own a toaster, or have hot and cold running water inside your house. Read the document - these things aren't mentioned at all!
Perhaps you should stay at home and cower under the covers.
I can go on an airplane with an ID and enough items that are still allowed and cause damage if that was my intent.
Or I can enter a Federal 'installation' as they call it without showing ID AND get weapons and explosive devices or guns inside if that was my intent too.
If someone intends to kill themselves in the process of killing you, there ain't a whole that you can do and showing an ID card to a moron who doesn't know what he's looking at ain't gonna help you neither.
Quit worrying about your pathetic life and start being free.
You are committing the logical fallacy of trying to prove a negative. One cannot prove that he is not going to take peoples' lives on the plane. The Constitution does protect Individual Rights. The government of the United States as it currently operates is eating those rights alive. Your argument would be valid, if and only if, the individual corporations require their customers to show identification. That would be laissez-faire capitalism at work. And I'd be free to fly another airline if I didn't want to give i.d.
But it is the government who passed this law, I'm sure. And by your reasoning, why don't the bus lines require papers? And by your reasoning, we will all be forced to carry government i.d. in order to protect ourselves from individuals who pose a danger to our lives. Now that is circular reasoning.