Justice can be an elusive concept, changing from century to century. What was accepted in one era, like slavery, can be unthinkable in another.
The biblical test of a just society was based on how people treated the widow, the orphan, and the stranger. These people were the underdogs of society, having no immediate family to protect them.
Who are the underdogs in our era? Who are the people most deserving of protection?
One group is clearly people with disabilities. They frequently have less education, less opportunity for fruitful jobs, and they face a society that is ambivalent about them.