Because hypocrisy, that's why.
So sad that the average person has no idea of this. Or the outrages caused by the TSA. Their sole purpose is to intrude and abuse the public in a forum that must be used daily by the public in order to "freely" travel. Every tyrannical regime has enacted some sort of agency or act in order to dehumanize and demoralize the masses in order to prepare and condition them to be subservient to the police state. They're preparing, so why shouldn't we?