Odd isn't it that a significant number of fathers beat, kill or leave their offspring.Marriage laws at their core exist to tie men to responsibility to their children.
A gay person cannot be put in this position. He/she cannot abandon his/her offspring that were naturally created with a same sex partner.
Marriage is about responsibility, not privilege. Each party has a duty to the other.
Traditionally the man had the responsibility to provide and protect and women had to be faithful and nurture. The laws were designed to support the natural order.
Homosexual relations cannot be part of this natural order because they do not give life and do not need protection the same way that life giving relations do.
And they don't care if they leave the marriage.
Given that doesn't it make your ignorant blanket statement as dumb as claiming Florida oranges are in the animal kingdom?