First Boomer, sexuality is only a choice for bisexuals, and even then, they're still bisexual. The fact that I married a man doesn't change my inclination toward women.
Second, a loved child with a support system, is a loved child with a support system. Within hetero marriages it can be lacking, while single moms may ensure their children are surrounded by great family. I don't disagree with you that the ideal is a stable home with a range of influences and viewpoints which is what tends to be provided by in stereotypical hetero marriages, but, that only applies as an ideal, it doesn't apply to individuals. Within actual hetero marriages there are women who are cruel and cold, men who are ***** whipped beyond any recognition of masculinity.... there are men who beat their wives in front of their kids, etc.
Adoption should be based on the individuals applying, not the 'ideal family unit'.
For anyone wondering about the true source of these rules.... it is NOT Putin, it is the church that put him in power, and keeps him in power. It runs Russia right now, and it is enacting these rules, not in the interest of children, but in the interest of attempting to control the democratic process in one of the most underhanded ways possible.... by threatening the welfare of children and families.