You not only are trying to equate the exception to the rule, you are denying the preference of the child. But fundamentally, evolution has established the best setting for offspring through millions of years of refinement.<quoted text>
No, we undermine childrens' potential by teaching them bigotry.
While it may (or may not) be the "ideal" for a child to be raised in an intact (mom/dad) family, we do not prohibit other families from existing, and many, MANY children from single parent households and gay parent households will outperform and be better adjusted than many children from more traditional households, and especially more than the effed up step-family situations.
Additionally you accurately slam step families but ignore the fact that many SS households are in fact step.