Rights are not absolute out in the real world. There are always tradeoffs, especially when various rights come into conflict with one another. The second amendment clearly states that "the right of the people to keep and bear arms shall not be infringed." Does that mean that it is unconstitutional for me to be prevented from bringing an Uzi onto an airplane? The various political and judicial processes that have been established are how we balance these various rights to achieve some condition that most of us are satisfied with. Rights may not come from written constitutions or governments, but those creations are what we use to negotiate amongst ourselves when various rights appear to be in conflict.