Why did not the Good Being protect his possessions from the assaults of his Evil neighbour ?

But if that Light (?) had been God, if he was good or just, it would have been incumbent on his Goodness and Justice to surround his place with a strong wall, and preserve his freedom and honour from his unclean Enemy and from his raving Neighbour, especially when the Good (Being) had perceived that his nature was capable of being injured, as they say—though God forbid that this should be said concerning the perfect Good! But if in their shame they turn and say that it is not injured, then whom do they teach—is it not one who is in error? [P. 35, l.30.] And whom do they heal—is it not one who is smitten? And whom do they teach the creed—is it not one who denies and [lxvi] blasphemes ? For these evils with innumerable others happened, and are happening to the Souls which (come) from him. And if they are not from him, and are in his Domain it was incumbent upon him as one who is wise and loves his possessions to place a protecting wall around his flocks which were capable of being injured.