So, we need more gay people to have kids...

[Beskar]

There is some circular logic going on in this statement.

The children of a homosexual couple will only have trouble fitting into a school full of children who have been taught, either directly or indirectly, that homosexuality is somehow wrong. Does the issue lie with the homosexual couple or the dimwits who instill intolerance in their children?

Agreed. I take the view that it is the dimwits who instill the intolerance in their children. Any good parent would educate the child on something they don't understand, in order to promote tolerance. Intolerance breeds in ignorance.

Even if a child initially "doesn't understand" why Timmy has two mothers, it is the parents/teachers job simply to educate them.

This issue occurs in similar subjects, such as adopted children, children in carehomes, etc.