Einstein did marry and have at least one kid. I remember reading about him thinking about theoretical physics while walking around pushing his baby stroller.
Also, as an aside, although the people you listed were extremely smart, there are plenty of people on that intelligence level. What differentiated them was their love/obsession, practically to the exclusion of everything else. In general, it is more the obsessive nature of the personalities than the level of intelligence that may have caused them to avoid raising children.