Definitions are made by people and are updated on a regular basis. What tradition is so sacrosanct that millions of people should be denied basic human rights to perpetuate it?
Slavery was a tradition. That women couldn't vote or own property was a tradition. Someone from a culture with the tradition of polygamy, which Mr. Leifker mentions as undesirable, could make the same argument that this tradition should be upheld.
"Where does it end?" he asks. It would be wonderful if it would end in all people being able to make loving commitments to each other in marriage.
Shouldn’t the “end” be allowing all adults to marry the consenting person or person(s) he or she wants to marry? Why do we deny this right to any free, consenting adult?