פירוש על קידושין 57:11

To the Talmud, this verse lays out the basic obligation for a father to circumcise his son.

If the father is negligent in his duty, then the court must circumcise him. If the court does not do so, then he has an obligation to get himself circumcised. Would really not be easy to become an adult and then find out your Dad and the court did not circumcise you.