I am not travelling with top secret information.
How do you know, isn't the government deciding which information is vital and which is not? You are restating the nonsensical 'If you do not have to hide something ...' argument. Individual privacy is not at the discretion of the government - well, not if it is a democratic government of an open and free society.
Many people in Germany [and other countries at slightly later points in history] had nothing to hide on 29th January 1933. Guess what happened to their non-secrets just a day later ...
The big difference between stupidity of individuals and governMENTAL interference in regard to provacy is that every individual has the right to make himself the butt of a joke*, but no authority has any right to make the same. My privacy is my decision, not theirs.
PS: I am aware of several pertaining facts, like non-US citizens do not have all the rights of the American Constitution and the Bill of Rights [though it turns out they do have a bit of protection]. Clearly there are also cases in which information about somebody cannot be held private even if the person wants it [think of criminals]. And there are those cases where a tit-for-tat comes in.
*This is may answer to those claiming that people already publicise their privates on-line, thorugh so-called 'social networks'.