Unlike what Progressives would like us all to believe, it is NOT just just a simple matter of allowing a new subset of the population to marry. What we call the "family structure" is based on the idea that sex between men and women makes babies. Because sex between 2 men or 2 women does not make babies, the “family structure” must be completely changed in order to accommodate gays into marriage.
We must remove the foundation of family in the legal code (bride, groom, husband, wife, mother, father--words all based in the objective facts of biology) and replace this objective foundation with "gender neutral" words--words that have no basis in objectivity or reality.
And that's why the family structure will be harmed..... for everybody.