Unfortunately, the argument is hurt by the fact that there are plenty of people who can have kids, who make terrible parents.
Sure - and how could adding perverts to the equation make things worse?
For sure there’s much more to parenting than being a man and woman, but that’s the start. If two people of the same sex were meant to be parents, they’d be able to conceive.
Parenting needs to be done under the wisdom and guidance of the creator.