Nurture has a lot to do with brain development (meaning parental interaction with a child). Children who are abused or neglected do not have proper brain development. The two go hand in hand.
That's nice.
When adults with deficiencies in prefrontal lobes and/or amygdala improper brain development REGARDLESS OF CAUSE commit murder they need to be permanently removed from civil society.
There are plenty of abused, neglected and congenitally damaged children who manage to grow up to live full and productive lives.