Do you think having children is a fundamental human right? Should there should be any restrictions?
No I don't. If someone has shown themselves repeatedly to be unable to care for the children they have. If they've harmed children, either their own or others and are clearly a threat to children, they should be forbidden from ever having any (more).
Having children should not be about the parents rights, it should be about the children's rights. And their right to grow up safe, without having to fear their own parents.