How many Lesbian couples have children who don't have gender issues. I direct you to Zach Wahls. http://www.youtube.com/watch?v=x20HkLyrdW4&feature=related.
Don't Generalise a whole group of people based on the action of two.
For one it's extremely offensive to base an opinion of a whole group of people on the actions of two, who probably believed that they were doing what's in the best interest, albeit to the extreme.