Thing is if you're choosing parents, you're going to set out to make tham as ideal as possible.
14 year olds and alcoholics etc, as mentioned can have children, yet we'd be up in arms if these were adopting.
You need boundries for fucks sake, some big fat cunt who could drop dead at any minute due to all that strain on his heart, is not ideal for an adopted child, don't need the brains of an archbishop to see that...

How many saying it's wrong would employ someone that size if they had a small business?
I wouldn't for fear of sickness and not being physically fit enough for certain aspects of the job if physical, which being a parent is.
Time to be realistic, it's not always good to stick up for the fat guy.